镁合金与多金属材料共线表面处理关键技术及产业化应用

摘 要

多材料混合设计已成为汽车轻量化、3C消费电子及新能源装备的主流技术路线，钢、铝、镁在同一构件或同一产线上共存已成常态。然而，镁合金因化学活性极高、标准电极电位最低（-2.37 V）、不耐酸碱、耐温受限，长期被排除在传统钢铝共线涂装体系之外，须单独建线处理，已成为制约镁合金规模化应用的核心工艺瓶颈。

合肥华清高科自主研发的SCCT自修复导电转化膜技术，凭借宽pH稳定性（pH 2～12）、多金属成膜兼容性、优异导电性（表面电阻<0.2 mΩ）和自修复防护四大核心特性，首次实现镁合金与钢、铝、锌在同一条前处理-电泳-涂装产线上的共线处理。该技术仅需将传统磷化槽液替换为SCCT处理液即可"零改造入线"，打通了镁合金进入主流涂装产线的"最后一公里"。SCCT+电泳复合体系中性盐雾寿命≥1400 h，SCCT+喷粉体系≥1200 h，全流程无铬无磷，已在汽车电池托盘、车身结构件、3C中框等场景完成量产验证，为镁合金规模化应用清除了最大的工艺障碍。

1 、技术应用背景

多材料混合设计正在重塑高端制造的材料格局。在新能源汽车领域，钢-铝-镁混合车身、镁合金电池托盘、一体化压铸结构件加速普及；在3C消费电子领域，镁铝混合中框已成为轻薄化旗舰机型的标配；在新能源装备领域，多种金属在同一构件上协同服役已成常态。共线表面处理——即在同一条前处理-电泳-涂装生产线上同时完成两种及以上金属基材的表面转化与涂层沉积，无需分线处理、无需切换工艺体系——已成为主机厂降本增效的必然选择。

传统钢铝共线前处理以磷化或硅烷/锆盐薄膜工艺为核心。磷化液为强酸性（pH约2.5～3.5），镁合金入槽会剧烈溶解并释放大量Mg²⁺，污染槽液、加速沉渣、导致磷化膜疏松；硅烷/锆盐薄膜工艺虽温和，但对镁表面自然氧化膜的转化能力不足，膜层结合力差。同时，镁与钢（-0.44 V）、铝（-1.66 V）、锌（-0.76 V）之间存在巨大电位差，共线处理后连接部位电偶腐蚀风险极高。镁合金因而长期被排除在共线体系之外，行业只能采用"镁合金单独前处理+离线涂装"或"镁合金微弧氧化后再拼线"的迂回方案，已成为制约镁合金在汽车、3C等领域规模化应用的行业公认"卡脖子"难题。

2 、行业共性技术瓶颈

镁合金与多金属材料共线表面处理是表面工程、电化学与涂装工艺交叉领域的共性技术难题，主要面临六大核心瓶颈：

（1）镁合金高活性与强酸前处理体系的矛盾。镁合金化学活性极强、标准电极电位低至-2.37 V，传统磷化液（pH 2.5～3.5）会使镁剧烈溶解，释放的Mg²⁺污染槽液、加速沉渣、导致膜层疏松；强碱脱脂（pH>13）同样会造成镁基体过腐蚀和表面粗糙化。

（2）多金属电位差导致的电偶腐蚀失控。镁与钢、铝、锌之间电位差巨大，共线处理后混合构件连接部位在潮湿、盐雾环境下形成宏观腐蚀原电池，镁作为阳极加速腐蚀，传统绝缘转化膜一旦破损即无法遏制。

（3）转化膜表面电阻过高与电泳均匀性的矛盾。传统转化膜表面电阻高且批次一致性差——磷化膜表面电阻为10³～10⁶ Ω量级，微弧氧化膜为>10⁶ Ω的绝缘陶瓷层，铬酸盐膜虽因含金属铬相而电阻偏低，但膜厚与组成波动导致导电不均——电泳时形成差异化电场屏蔽，多材料工件沉积效率差异大，膜厚波动达±20%，内腔、焊缝等弱电场区泳透力不足，严重影响涂层防腐一致性。

（4）单独建线带来的成本与效率瓶颈。"镁合金单独前处理+离线涂装"方案使产线投资显著增加、生产节拍大幅降低，转运、挂具、能耗等综合成本居高不下，直接削弱镁合金的性价比竞争力。

（5）铬酸盐淘汰与磷化污泥的双重环保压力。镁合金铬酸盐转化膜含Cr⁶⁺，受RoHS、REACH法规严格限制正在全球淘汰；钢铝磷化工艺产生大量含磷污泥，危废处理成本高，绿色合规已成主机厂硬性门槛。

（6）行业标准缺失与客户认证周期漫长。镁合金共线处理尚无国家标准或行业标准，各企业工艺规范和验收方法不统一；下游主机厂对镁合金共线涂装的认证周期通常长达18～24个月，技术验证到规模化应用仍需时间积累。

3 、合肥华清高科SCCT共线处理技术核心优势

依托十余年镁合金表面处理技术积累，合肥华清高科面向多材料共线涂装的产业需求，自主开发SCCT自修复导电转化膜技术，构建覆盖"脱脂-活化-转化膜-电泳-烘烤"全流程的共线工艺体系，核心成膜剂、自修复活性剂、工艺参数全部自主攻关，实现镁合金"零改造入线"。

3.1  全材料共线兼容，行业首创钢-铝-镁三金属共线

传统共线技术仅覆盖钢-铝双金属，镁合金始终被排除在外。SCCT技术首次将镁合金纳入共线体系，实现钢、铝、镁、锌四种金属在同一条产线上的同步前处理与电泳，无需为镁合金单独建线，从根本上消除了分线处理带来的投资浪费与节拍损失（详见表1、表2）。

3.2  导电转化膜保障共线电泳均匀性

传统转化膜表面电阻高且一致性差——磷化膜表面电阻为10³～10⁶ Ω量级，微弧氧化膜为>10⁶ Ω的绝缘陶瓷层，铬酸盐膜虽因含金属铬相而电阻偏低，但膜厚与组成波动导致导电不均，且六价铬体系受RoHS/REACH法规限制——电泳时形成差异化电场屏蔽，导致膜厚不均、内腔泳透力不足。SCCT膜层表面电阻<0.2 mΩ，接近裸金属状态，从根本上消除了高阻转化膜引起的电场屏蔽效应，使多材料工件在同一电泳槽中实现均匀沉积，三基材电泳膜厚差异控制在±3 μm以内（详见表1）。

3.3  自修复双重防护，防腐性能行业领先

SCCT膜层兼具导电性和自修复功能，0.5 mm划痕可在腐蚀介质触发下自动封闭。SCCT+电泳复合体系中性盐雾寿命≥1400 h，SCCT+喷粉体系≥1200 h，远超传统磷化+电泳的500 h水平；0.5 mm人工划痕后盐雾1000 h单边蠕变<2 mm，实现从"被动屏障"到"主动防御"的跨越。

3.4  无铬无磷环保合规，顺应全球绿色趋势

传统镁合金防腐高度依赖铬酸盐转化膜（含Cr⁶⁺），受RoHS、REACH法规严格限制；钢铝共线磷化工艺产生大量含磷污泥（铝合金磷化渣12～15 g/m²），危废处理成本高。SCCT技术全程无铬、无磷、无重金属，槽液沉渣量<1 g/m²，废水处理成本降低60%以上，工艺能耗比传统电镀降低60%以上，符合欧盟REACH、中国RoHS及汽车行业IMDS要求。

4 、工艺方案与技术突破

4.1  全流程共线工艺体系

SCCT共线工艺覆盖"脱脂-活化-转化膜-电泳-烘烤"全流程，仅需将传统磷化槽液替换为SCCT处理液即可实现"零改造入线"，无需新增槽体或改造工位，周末切换即可投产。核心成膜剂、自修复活性剂及全部工艺参数均为自主攻关，不依赖进口助剂。

4.2  SCCT自修复导电转化膜成膜技术

采用纳米复合成膜剂设计、原位自组装技术及自修复嵌入机制，在镁、钢、铝表面同时形成3～10 μm致密导电转化膜：膜层在pH 2～12范围内保持化学惰性；不依赖基材释放特定金属离子，同槽处理后三种基材膜重差异<5 mg/m²；表面电阻<0.2 mΩ；0.5 mm划痕可在腐蚀介质触发下自动封闭。

4.3  共线电泳均匀沉积技术

依托SCCT膜层高导电性，采用高泳透力阴极电泳漆，入槽电压阶梯式提升以避免镁表面针孔和条纹，三基材电泳膜厚差异控制在±3 μm以内，确保钢、铝、镁在同一电泳槽中获得均匀一致的涂层质量。

5 、核心性能指标与技术路线对比

5.1  核心性能指标

表1  华清高科SCCT镁合金共线表面处理核心性能指标

表2  镁合金共线表面处理技术路线核心性能对比

性能指标	传统磷化共线（钢铝）	硅烷/锆盐薄膜	微弧氧化+拼线	SCCT共线技术
镁合金共线兼容性	不兼容，强酸剧烈溶解	结合力差，无法共线	需离线处理后拼线	钢/铝/镁/锌同槽共线
自修复能力	无	无	无	0.5 mm划痕自动封闭
复合体系中性盐雾寿命	500～720 h	500～700 h	800～1000 h	≥1400 h（电泳）/≥1200 h（喷粉）
电泳膜厚均匀性	±20%波动	±20%波动	拼线均匀性差	±3 μm以内
产线适配方式	镁需单独建线，投资超3000万元/条	需改造槽液与工位	需独立微弧氧化设备	槽液级替换，周末切换即可投产
环保合规性	含磷污泥12～15 g/m²	较好	能耗高	无铬无磷，沉渣<1 g/m²

6 、典型应用场景

6.1  新能源汽车领域

适用于镁合金电池托盘、车身结构件、副车架、一体化压铸构件等。镁合金零部件可直接进入主机厂现有涂装线，与钢、铝车身共线完成前处理与电泳，无需额外建线投资；涂装成本降低30%～40%，生产周期缩短50%，显著提升镁合金相对于铝合金和工程塑料的性价比竞争力。

6.2  3C消费电子领域

适用于智能手机、笔记本电脑镁铝混合中框与结构件，可共线完成PVD前处理和喷漆，良率从70%提升至90%以上；导电膜层同时满足3C产品对电磁屏蔽和表面电阻的严苛要求。

6.3  航空航天与高端装备领域

适用于航空航天镁合金轻量化结构件、机载设备壳体等多材料混合构件的共线防护涂装，无铬配方满足军工与航空领域环保合规要求，自修复特性保障极端工况下的长寿命防腐。

6.4  新能源装备领域

适用于储能设备、氢能装备、充电桩等钢-铝-镁混合结构件的共线涂装，单条产线年减少危废产生量约50吨，降低废水处理成本60%，减少CO₂排放约30%，助力新能源装备全生命周期绿色制造。

7 、结语

镁合金与多金属材料共线表面处理技术的突破，是中国镁合金表面处理产业从"专用线跟跑"走向"共线化领跑"的核心缩影。SCCT自修复导电转化膜技术以宽pH稳定、多金属兼容、导电均匀、自修复防护四大核心特性，系统性破解了镁合金无法与钢铝共线处理的行业难题，首次实现镁合金以零改造方式进入主机厂主流涂装产线。随着超大型一体化压铸件工艺优化、低温固化涂料配套和行业标准建立，镁合金共线处理将从汽车领域向3C、航空航天、新能源装备全场景扩展，成为推动高端装备轻量化升级的核心使能技术。

Abstract

Multimaterial hybrid design has become the mainstream technical route for automotive lightweighting, 3C consumer electronics, and new energy equipment, with steel, aluminum, and magnesium coexisting in the same component or production line becoming the norm. However, due to its extremely high chemical activity, the lowest standard electrode potential (-2.37 V), poor acid and alkali resistance, and limited temperature tolerance, magnesium alloy has long been excluded from traditional steel-aluminum collinear coating systems and must be treated on dedicated lines, which has become the core process bottleneck restricting the large-scale application of magnesium alloys.

Hefei Huaqing Gaoke's independently developed SCCT (Self-healing Conductive Conversion Coating) technology, featuring four core properties—wide pH stability (pH 2–12), multimetal coating compatibility, excellent conductivity (surface resistance <0.2 mΩ), and self-healing protection—has for the first time enabled collinear treatment of magnesium alloy with steel, aluminum, and zinc on the same pretreatment-electrophoresis-coating line. The technology requires only replacing the traditional phosphating bath with SCCT treatment solution to achieve "zero-modification line integration," breaking through the "last mile" for magnesium alloys to enter mainstream coating lines. The SCCT+electrophoresis composite system achieves a neutral salt spray (NSS) life of ≥1400 h, and the SCCT+powder coating system ≥1200 h. The entire process is chromium-free and phosphorus-free, and has completed mass production verification in automotive battery trays, body structural parts, 3C mid-frames, and other scenarios, removing the largest process obstacle to the large-scale application of magnesium alloys.

1  Technical Application Background

Multimaterial hybrid design is reshaping the material landscape of high-end manufacturing. In the new energy vehicle sector, steel-aluminum-magnesium hybrid bodies, magnesium alloy battery trays, and integrated die-cast structural parts are accelerating in adoption; in the 3C consumer electronics sector, magnesium-aluminum hybrid mid-frames have become standard for thin and light flagship models; in the new energy equipment sector, multiple metals serving collaboratively in the same component has become the norm. Collinear surface treatment—simultaneously completing surface conversion and coating deposition for two or more metal substrates on the same pretreatment-electrophoresis-coating line, without separate-line processing or process switching—has therefore become an inevitable choice for OEMs to reduce costs and increase efficiency.

Traditional steel-aluminum collinear pretreatment is centered on phosphating or silane/zirconium thin-film processes. Phosphating solutions are strongly acidic (pH approx. 2.5–3.5); magnesium alloy entering the bath dissolves vigorously and releases large amounts of Mg²⁺, contaminating the bath, accelerating sludge formation, and causing porous phosphating coatings. Although silane/zirconium thin-film processes are milder, they lack sufficient conversion capability for the natural oxide film on magnesium surfaces, resulting in poor coating adhesion. Meanwhile, the large potential differences between magnesium and steel (-0.44 V), aluminum (-1.66 V), and zinc (-0.76 V) pose extremely high galvanic corrosion risks at joints after collinear treatment. Magnesium alloy has thus long been excluded from collinear systems, and the industry can only adopt detour schemes such as "dedicated magnesium pretreatment + offline coating" or "magnesium micro-arc oxidation followed by line integration," which has become an industry-recognized "chokepoint" problem restricting the large-scale application of magnesium alloys in automotive, 3C, and other fields.

2  Common Industry Technical Bottlenecks

Collinear surface treatment of magnesium alloys and multimetal materials is a common technical challenge at the intersection of surface engineering, electrochemistry, and coating processes, facing six core bottlenecks:

(1) Conflict between high magnesium activity and strongly acidic pretreatment systems. Magnesium alloy has extremely high chemical activity with a standard electrode potential as low as -2.37 V. Traditional phosphating solutions (pH 2.5–3.5) cause vigorous dissolution of magnesium, releasing Mg²⁺ that contaminates the bath, accelerates sludge, and leads to porous coatings; strongly alkaline degreasing (pH >13) likewise causes over-corrosion and surface roughening of the magnesium substrate.

(2) Uncontrolled galvanic corrosion caused by multimetal potential differences. The large potential differences between magnesium and steel, aluminum, and zinc form macroscopic galvanic cells at joints of hybrid components in humid and salt-spray environments after collinear treatment, with magnesium corroding acceleratively as the anode. Once damaged, traditional insulating conversion coatings cannot contain this corrosion.

(3) Conflict between excessive conversion coating surface resistance and electrophoresis uniformity. Traditional conversion coatings have high surface resistance and poor batch consistency—phosphating coatings have surface resistance on the order of 10³–10⁶ Ω, micro-arc oxidation coatings are insulating ceramic layers >10⁶ Ω, and although chromate coatings have lower resistance due to metallic chromium phases, fluctuations in coating thickness and composition cause uneven conductivity—resulting in differentiated electric-field shielding during electrophoresis, large variations in deposition efficiency across multimaterial workpieces, film thickness fluctuations of ±20%, and insufficient throwing power in weak-field regions such as internal cavities and welds, severely affecting coating corrosion consistency.

(4) Cost and efficiency bottlenecks from dedicated-line construction. The "dedicated magnesium pretreatment + offline coating" scheme significantly increases line investment and substantially reduces production takt time, with comprehensive costs for transfer, racking, and energy remaining high, directly undermining the cost-performance competitiveness of magnesium alloys.

(5) Dual environmental pressure from chromate phase-out and phosphating sludge. Magnesium alloy chromate conversion coatings contain Cr⁶⁺ and are being phased out globally under strict RoHS and REACH restrictions; steel-aluminum phosphating processes generate large volumes of phosphorus-containing sludge with high hazardous-waste treatment costs, and green compliance has become a hard threshold for OEMs.

(6) Lack of industry standards and lengthy customer certification cycles. There are as yet no national or industry standards for magnesium alloy collinear treatment, and process specifications and acceptance methods vary among enterprises; downstream OEM certification cycles for magnesium alloy collinear coating typically last 18–24 months, and the transition from technical verification to large-scale application still requires time.

3  Core Advantages of Hefei Huaqing Gaoke SCCT Collinear Treatment Technology

Leveraging over a decade of accumulated expertise in magnesium alloy surface treatment, Hefei Huaqing Gaoke has independently developed SCCT self-healing conductive conversion coating technology in response to the industrial demand for multimaterial collinear coating, building a collinear process system covering the full "degreasing–activation–conversion coating–electrophoresis–baking" workflow. The core film-forming agents, self-healing activators, and process parameters are all independently developed, achieving "zero-modification line integration" for magnesium alloys.

3.1  Full-Material Collinear Compatibility: Industry-First Steel-Aluminum-Magnesium Trimetal Collinearity

Traditional collinear technologies cover only steel-aluminum bimetal systems, with magnesium alloy always excluded. SCCT technology incorporates magnesium alloy into the collinear system for the first time, enabling simultaneous pretreatment and electrophoresis of steel, aluminum, magnesium, and zinc on the same production line without a dedicated magnesium line, fundamentally eliminating the investment waste and takt-time loss caused by split-line processing (see Tables 1 and 2).

3.2  Conductive Conversion Coating Ensures Collinear Electrophoresis Uniformity

Traditional conversion coatings have high surface resistance and poor consistency—phosphating coatings have surface resistance on the order of 10³–10⁶ Ω, micro-arc oxidation coatings are insulating ceramic layers >10⁶ Ω, and although chromate coatings have lower resistance due to metallic chromium phases, fluctuations in coating thickness and composition cause uneven conductivity, and hexavalent chromium systems are restricted by RoHS/REACH regulations—resulting in differentiated electric-field shielding during electrophoresis, uneven film thickness, and insufficient throwing power in internal cavities. The SCCT coating has a surface resistance of <0.2 mΩ, close to that of bare metal, fundamentally eliminating the electric-field shielding effect caused by high-resistance conversion coatings and enabling uniform deposition of multimaterial workpieces in the same electrophoresis bath, with the electrophoresis film thickness difference across the three substrates controlled within ±3 μm (see Table 1).

3.3  Dual Self-Healing Protection: Industry-Leading Corrosion Resistance

The SCCT coating combines conductivity with self-healing capability: a 0.5 mm scratch can be automatically sealed upon trigger by corrosive media. The SCCT+electrophoresis composite system achieves a neutral salt spray life of ≥1400 h, and the SCCT+powder coating system ≥1200 h, far exceeding the 500 h level of traditional phosphating+electrophoresis; after a 0.5 mm artificial scratch, unilateral creepage after 1000 h of salt spray is <2 mm, achieving a leap from "passive barrier" to "active defense."

3.4  Chromium-Free and Phosphorus-Free Environmental Compliance, Aligned with Global Green Trends

Traditional magnesium alloy corrosion protection relies heavily on chromate conversion coatings (containing Cr⁶⁺), strictly restricted by RoHS and REACH regulations; steel-aluminum collinear phosphating processes generate large volumes of phosphorus-containing sludge (aluminum alloy phosphating sludge 12–15 g/m²) with high hazardous-waste treatment costs. SCCT technology is entirely free of chromium, phosphorus, and heavy metals throughout the process, with bath sludge <1 g/m², wastewater treatment costs reduced by over 60%, and process energy consumption reduced by over 60% compared with traditional electroplating, complying with EU REACH, China RoHS, and automotive industry IMDS requirements.

4  Process Scheme and Technical Breakthroughs

4.1  Full-Process Collinear Process System

The SCCT collinear process covers the full "degreasing–activation–conversion coating–electrophoresis–baking" workflow. Simply replacing the traditional phosphating bath with SCCT treatment solution achieves "zero-modification line integration" without adding tanks or modifying stations, and production can commence after a weekend switchover. The core film-forming agents, self-healing activators, and all process parameters are independently developed, with no dependence on imported additives.

4.2  SCCT Self-Healing Conductive Conversion Coating Formation Technology

Using nanocomposite film-forming agent design, in-situ self-assembly technology, and a self-healing embedding mechanism, a dense conductive conversion coating of 3–10 μm is simultaneously formed on magnesium, steel, and aluminum surfaces: the coating remains chemically inert within pH 2–12; without relying on substrate release of specific metal ions, the coating weight difference across the three substrates after same-bath treatment is <5 mg/m²; surface resistance is <0.2 mΩ; and a 0.5 mm scratch can be automatically sealed upon trigger by corrosive media.

4.3  Collinear Electrophoresis Uniform Deposition Technology

Relying on the high conductivity of the SCCT coating, high-throwing-power cathodic electrophoresis paint is employed, with stepped ramp-up of the entry voltage to avoid pinholes and streaks on magnesium surfaces. The electrophoresis film thickness difference across the three substrates is controlled within ±3 μm, ensuring uniformly consistent coating quality for steel, aluminum, and magnesium in the same electrophoresis bath.

5  Core Performance Indicators and Technology Route Comparison

5.1  Core Performance Indicators

Table 1  Core Performance Indicators of Huaqing Gaoke SCCT Magnesium Alloy Collinear Surface Treatment

Table 2  Core Performance Comparison of Magnesium Alloy Collinear Surface Treatment Technology Routes

Performance Indicator	Traditional Phosphating Collinear (Steel-Al)	Silane/Zirconium Thin Film	Micro-Arc Oxidation + Line Integration	SCCT Collinear Technology
Magnesium collinear compatibility	Incompatible; vigorous dissolution in strong acid	Poor adhesion; cannot be collinear	Requires offline treatment then line integration	Steel/Al/Mg/Zn same-bath collinear
Self-healing capability	None	None	None	0.5 mm scratch auto-sealing
Composite NSS life	500–720 h	500–700 h	800–1000 h	≥1400 h (electrophoresis) / ≥1200 h (powder)
Electrophoresis film thickness uniformity	±20% fluctuation	±20% fluctuation	Poor line-integration uniformity	Within ±3 μm
Line adaptation method	Mg requires dedicated line; investment >30M RMB/line	Requires bath and station modification	Requires independent MAO equipment	Bath-level replacement; weekend switchover to production
Environmental compliance	Phosphorus sludge 12–15 g/m²	Relatively good	High energy consumption	Cr-free, P-free; sludge <1 g/m²

6  Typical Application Scenarios

6.1  New Energy Vehicle Sector

Applicable to magnesium alloy battery trays, body structural parts, subframes, integrated die-cast components, etc. Magnesium alloy parts can directly enter OEMs' existing coating lines and complete pretreatment and electrophoresis collinearly with steel and aluminum bodies without additional line investment; coating costs are reduced by 30–40%, production cycles shortened by 50%, significantly enhancing the cost-performance competitiveness of magnesium alloys relative to aluminum alloys and engineering plastics.

6.2  3C Consumer Electronics Sector

Applicable to magnesium-aluminum hybrid mid-frames and structural parts for smartphones and laptops, enabling collinear completion of PVD pretreatment and painting, with yield improved from 70% to over 90%; the conductive coating simultaneously meets the stringent requirements of 3C products for electromagnetic shielding and surface resistance.

6.3  Aerospace and High-End Equipment Sector

Applicable to collinear protective coating of multimaterial hybrid components such as aerospace magnesium alloy lightweight structural parts and airborne equipment housings. The chromium-free formulation meets environmental compliance requirements of military and aerospace sectors, and the self-healing property ensures long-life corrosion protection under extreme operating conditions.

6.4  New Energy Equipment Sector

Applicable to collinear coating of steel-aluminum-magnesium hybrid structural parts for energy storage equipment, hydrogen energy equipment, and charging piles. A single production line reduces annual hazardous waste generation by approximately 50 tons, lowers wastewater treatment costs by 60%, and reduces CO₂ emissions by approximately 30%, supporting full-lifecycle green manufacturing of new energy equipment.

7  Conclusion

The breakthrough in collinear surface treatment technology for magnesium alloys and multimetal materials is a core microcosm of China's magnesium alloy surface treatment industry moving from "dedicated-line follower" to "collinear leader." With four core properties—wide pH stability, multimetal compatibility, conductive uniformity, and self-healing protection—SCCT self-healing conductive conversion coating technology systematically solves the industry problem of magnesium alloys being unable to undergo collinear treatment with steel and aluminum, achieving for the first time zero-modification entry of magnesium alloys into OEM mainstream coating lines. With the optimization of ultra-large integrated die-casting processes, the development of low-temperature curing coatings, and the establishment of industry standards, magnesium alloy collinear treatment will expand from the automotive sector to 3C, aerospace, and new energy equipment scenarios, becoming a core enabling technology driving the lightweight upgrade of high-end equipment.