等离子喷涂FeCrMoCBY铁基非晶涂层耐蚀性研究  

Long-term Corrosion Resistance of Plasma Sprayed FeCrMoCBY Fe-based Amorphous Coating in 3.5%NaCl Solution

作　　者：吴林涛 周泽华[1] 张欣[1] 杨光恒 张凯城 王光宇 WU Lintao;ZHOU Zehua;ZHANG Xin;YANG Guangheng;ZHANG Kaicheng;WANG Guangyu(College of Mechanics and Materials,Hohai University,Nanjing 211100,China)

机构地区：[1]河海大学力学与材料学院,南京211100

出　　处：《中国腐蚀与防护学报》2021年第5期717-720,共4页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金(51909071);中央高校基本科研业务费专项(B200202133);江苏省自然科学基金(BK20190493)。

摘　　要：采用等离子喷涂技术制备了FeCrMoCBY铁基非晶涂层,研究了铁基非晶涂层在3.5%NaCl溶液中浸泡不同时长后的电化学腐蚀性能和微观组织结构。结果表明,在720 h的浸泡期间,涂层的耐蚀性经历了先提高后降低的变化,在浸泡216 h时达到最优,腐蚀电流密度达到最低,为3.393×10^(-5)A·cm^(-2),且此时涂层的表面更加致密,没有明显孔隙。在经过720 h浸泡后,涂层仍能保持在一个相对较低的腐蚀电流密度6.970×10^(-5)A·cm^(-2)。FeCrMoCBY amorphous coatings were prepared on Q235 carbon steel plates by means of plasma spraying technique.Then,the electrochemical corrosion resistance and microstructure of the coatings after immersion in 3.5%NaCl for different periods were characterized.The results showed that the corrosion resistance of the coatings increased at first and then decreased during the period of 720 h immersion.After 216 h immersion,the corrosion resistance of the coatings achieved the optimal,while the corrosion current density of the coatings reached the minimum 3.393×10^(-5)A·cm^(-2);the coating surface seemed much compact,while no apparent defects can be seen.The main reason is that the corrosion products piled up in the defects.What's more,it's found that Cr concentrated in corrosion products,which meant that the passivation of Cr may play a key role in the improvement of corrosion resistance for the coating.In addition,the coating can still maintain a relatively low corrosion current density after 720 h immersion,which is 6.970×10^(-5)A·cm^(-2).

关 键 词：等离子喷涂 铁基非晶 涂层 耐蚀性 

分 类 号：TG174[金属学及工艺—金属表面处理]