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A3钢在含Fe~(3+)的盐酸溶液中的脆断机理

程玉峰 , 杜元龙

中国腐蚀与防护学报

应用原子氢渗透速率测量传感器测定了在５％ＨＣｌ溶液中添加不同含量的Ｆｅ（３＋）时体系渗氢水平（渗氢电流）的变化；采用慢应变速率拉伸（ＳＳＲＴ）试验研究了Ａ３钢在５％ＨＣｌ＋Ｆｅ（３＋）溶液中于阴、阳极极化电位下的脆断敏感性及其断裂机制．结果表明，随着溶液中Ｆｅ（３＋）含量的增加，渗氢水平逐渐下降；Ａ３钢在溶液中的脆性系数（Ｆ％）随Ｆｅ（３＋）含量变化曲线上出现一个极小值；在含０．０１％Ｆｅ（３＋）的盐酸溶液中，阴极极化使Ｆ％增大，阳极极化则使Ｆ％减小；而在含０．３％Ｆｅ（３＋）的盐酸溶液中，极化的作用相反．结合断口的ＳＥＭ照片分析，认为５％ＨＣｌ溶液中Ｆｅ（３＋）含量的增加，使得Ａ３钢在该溶液中的断裂由氢致开裂机制向阳极溶解机制转变．

关键词: 脆断 , Mechanism , Hydrogen induced cracking (HIC) , Anodic dissolution , Steel , Hydrochloric acid , Ferric ion

环境因素对钢的大气腐蚀的影响

梁彩凤 , 侯文泰

中国腐蚀与防护学报

分析了我国七个试验点十七种钢的八年大气腐蚀试验结果,对润湿时间、二氧化硫及盐粒子的污染作用提出了新的看法。对非耐候钢,湿热条件对长期腐蚀的影响非常大,如果加上污染,会造成特别高的腐蚀。讨论了用气象及污染特征划分大气腐蚀性等级的ISO9223国际标准。碳钢、低合金钢在不同腐蚀环境中,暴露第一年期间所显示的大气腐蚀规律与长期暴露所显示的不同,因此用钢的第一年腐蚀结果来测定大气腐蚀性是不妥当的。

关键词: 大气腐蚀 , Steel , Environment factors , Atmospheric corrosivity

A Hybrid Joining Technology for Aluminum/Zinc Coated Steels in Vehicles

C.Y. Choi D.C. Kim D.G. Nam Y.D. Kim Y.D. Park

材料科学技术（英）

Currently, in the automotive industry, joining of the aluminum alloys with the steel is a crucial problem to be solved. Conventional joining techniques including resistance spot and gas metal arc welding are not acceptable for those applications due to a number of metallurgical problems. The investigation was carried out to develop the hybrid joining process combining the resistance spot welding and brazing. In this study, an attempt was made to apply hybrid process to the joining of dissimilar sheet metals, Al-Mg-Si (6000 series) alloy and low carbon steel sheet. Hybrid process (resistance spot weld/brazing) using filler metal was found to be effective to overcome the incompatibility between aluminum alloy and steel. Although hybrid joining process of Al alloy sheet and steel sheet did not produce acceptable bond strength, it was proved to have reasonable interfacial
bond layer if the optimal process condition was applied.

关键词: Hybrid joining , Aluminum , Steel , Welding

A Hybrid Joining Technology for Aluminum/Zinc Coated Steels in Vehicles

C.Y. Choi D.C. Kim D.G. Nam Y.D. Kim Y.D. Park

材料科学技术（英）

Currently, in the automotive industry, joining of the aluminum alloys with the steel is a crucial problem to be solved. Conventional joining techniques including resistance spot and gas metal arc welding are not acceptable for those applications due to a number of metallurgical problems. The investigation was carried out to develop the hybrid joining process combining the resistance spot welding and brazing. In this study, an attempt was made to apply hybrid process to the joining of dissimilar sheet metals, Al-Mg-Si (6000 series) alloy and low carbon steel sheet. Hybrid process (resistance spot weld/brazing) using filler metal was found to be effective to overcome the incompatibility between aluminum alloy and steel. Although hybrid joining process of Al alloy sheet and steel sheet did not produce acceptable bond strength, it was proved to have reasonable interfacial
bond layer if the optimal process condition was applied.

关键词: Hybrid joining , Aluminum , Steel , Welding

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