不同成分体系780 MPa级别双相钢的硅烷涂装性能  

Properties of 780 MPa dual-phase steels with different compositions after silanization and electrocoating

作　　者：张静[1] 孟凡月 王浩宇[1] 夏明生[1] 邝霜 黄健 吴俊娜 万盛兴 于慧勇 ZHANG Jing;MENG Fanyue;WANG Haoyu;XIA Mingsheng;KUANG Shuang;HUANG Jian;WU Junna;WAN Shengxing;YU Huiyong(Tangshan Iron and Steel Group Co.,Ltd.,Tangshan 063000,China;Shanghai Chemetall Chemicals Co.,Ltd.,Shanghai 200000,China;Hunan Xiangjiang KANSAI Paint Co.,Ltd.,Changsha 410000,China)

机构地区：[1]唐山钢铁集团有限责任公司,河北唐山063000 [2]上海凯密特尔化学品有限公司,上海200000 [3]湖南湘江关西涂料有限公司,湖南长沙410000

出　　处：《电镀与涂饰》2024年第2期69-75,共7页Electroplating & Finishing

摘　　要：[目的]车用高强度双相钢硅烷前处理后涂装性能的研究鲜有报道。[方法]选取了C-Si-Mn、C-Mn-Cr和C-Mn-Cr-Al三个成分体系的780MPa强度级别的双相钢进行相同工艺的硅烷化和电泳处理,通过中性盐雾、石击、循环盐雾腐蚀等手段评价了不同成分体系钢板上的硅烷膜和电泳漆膜的品质。[结果]C-Si-Mn成分体系钢板的硅烷涂装性能最差,硅烷膜表面出锈,电泳漆膜的附着力及耐蚀性较差,不能满足一般汽车厂的要求;C-Mn-Cr成分体系钢板经硅烷涂装后,除耐石击+循环盐雾腐蚀性能外,其他性能基本都能满足一般汽车厂的要求;C-Mn-Cr-Al成分体系的硅烷涂装性能最优,硅烷膜及电泳漆膜的各项性能均能满足一般汽车厂的要求。[结论]在应用780 MPa级别双相钢的过程中,应当根据应用环境来选择适合的成分体系。[Introduction]There are few reports on the post-silanization coatability of high-strength dual-phase steels for automotive applications.[Method]Three series of dual-phase steel with a strength of 780 MPa i.e.C–Si–Mn,C–Mn–Cr,and C–Mn–Cr–Al series were selected for the same silanization and electrocoating processes,and the quality of the silane film and the electrocoated paint was evaluated by neutral salt spray test,stone-chip impact test,and cyclic salt spray test.[Result]The coatability of C–Si–Mn series duel-phase steel is the worst due to the fact that corrosion occurs on the surface of silane film,and the adhesion and corrosion resistance of electrocoated paint are poor,which cannot meet the requirement of general automobile manufacturers.The performance indexes of the silanized and electrocoated C–Mn–Cr series dual-phase steel can meet the requirements,except the resistance to stone-chip impact plus cyclic salt spray corrosion.The C–Mn–Cr–Al series dual-phase steel has the best comprehensive performance because all the properties of silane film and electrocoated paint on it meet the requirements of general automobile manufacturers.[Conclusion]When applying a 780 MPa dual-phase steel to the manufacturing of automobiles,the proper selection of its composition according to the application environment is recommended.

关 键 词：双相钢 成分 硅烷前处理 电泳漆膜 附着力 耐蚀性 

分 类 号：TG178[金属学及工艺—金属表面处理]