热成型钢板、铝硅镀层钢板和热镀纯锌镀层钢板的耐蚀性研究  

Investigations on the Corrosion Properties of Uncoated, Al-Si Coated and Hot-Dip Pure Zinc Coated Hot-Stamped Steel Plates

作　　者：袁超 李华鑫 冯婷婷 张锦 姜发同 马秋 YUAN Chao;LI Hua-xin;FENG Ting-ting;ZHANG Jin;JIANG Fa-tong;MA Qiu(Geely Automobile Research Institute(Ningbo)Co.,Ltd.,Ningbo 315336,China)

机构地区：[1]吉利汽车研究院(宁波)有限公司,浙江宁波315336

出　　处：《材料保护》2022年第3期14-18,27,共6页Materials Protection

摘　　要：过去几年,热成型镀层钢板被广泛用于汽车轻量化零部件,以满足汽车工业日益严苛的燃油消耗、温室气体排放和乘员安全性法规要求。利用金相显微镜、扫描电子显微镜和盐雾试验箱等设备,对裸板、锌基镀层和铝硅镀层热成型钢板的形貌和腐蚀性能进行对比分析。结果表明:3种热成型材料的金相组织均为马氏体和少量残余奥氏体组织;铝硅镀层和锌基镀层热成型钢板镀层完整,未出现贯穿到基材的裂纹;热成型裸板脱碳层深度约为10μm,铝硅镀层由α-Fe相、Fe_(2)Al_(5)相、FeAl相和Fe_(2)Al_(5)相4层结构组成,锌基镀层主要由α-Fe相组成;裸板、铝硅镀层、锌基镀层热成型钢板在中性盐雾环境下出现5%红锈的时间分别为6,76,96 h,腐蚀深度分别为257,134,66μm;经电泳处理后的裸板、铝硅镀层、锌基镀层热成型钢板在中性盐雾环境下的腐蚀宽度分别为75.6,42.3,143.8μm,腐蚀深度分别为32.2,7.0,2.5μm,抗腐蚀性能排序为锌基镀层电泳板>铝硅镀层>裸板。In the last years, hot-stamped coating steel plates have been used to automobile lightweight parts widely to meet the increasingly stringent regulatory requirements for fuel consumption and greenhouse gas emissions while promoting passenger safety. Using metallographic microscope, scanning electron microscope(SEM) and salt spray test chamber, the coating morphology and corrosion performance of uncoated, hot-dip pure zinc coated and Al-Si coated hot-stamped steel plates were compared and investigated. Results showed that the metallographic structure of the three hot-stamped materials was mainly martensite with a small amount of retained austenite;the coatings of Al-Si coated and zinc coated hot-stamped steel plates were complete, and no cracks penetrating the base material were found;the decarburized layer depth of uncoated hot-stamped steel plate was about 10 μm, the Al-Si coating consisted of α-Fe, Fe_(2)Al_(5), FeAl and Fe_(2)Al_(5)layers, and the zinc coating was mainly composed of α-Fe phase;the time spans for occurring 5% red rust in neutral salt spray(NSS) environment for uncoated, Al-Si coated and zinc coated hot-stamped steel plates were 6, 76, 96 h, respectively, and the corrosion depth was 257, 134, 66 μm, respectively. Besides, in NSS environment, the corrosion width for uncoated, Al-Si coated and zinc coated hot-stamped steel plates with electrophoretic treatment was 75.6, 42.3, 143.8 μm and the corrosion depth was 32.2, 7.0, 2.5 μm, respectively. The corrosion resistance was zinc coated electrophoretic plate > Al-Si coated > uncoated plate in order.

关 键 词：热成型钢 铝硅镀层 纯锌镀层 腐蚀性能 

分 类 号：TG174.44[金属学及工艺—金属表面处理]