30Cr2Ni4MoV合金的抗盐雾腐蚀性能

Salt spray corrosion resistance of iron-based alloy 30Cr2Ni4MoV

为了解舰船常用铁基材料30Cr2Ni4MoV的盐雾腐蚀行为和腐蚀机理,对该合金在盐雾腐蚀下不同时间试样的表面和截面形貌以及腐蚀产物的组成、盐雾腐蚀的失重速率和腐蚀速率进行研究.结果表明:30Cr2Ni4MoV腐蚀400 h后,试样表面均布满腐蚀产物,主要腐蚀产物是FeO(OH),腐蚀产物与基体出现了脱离现象;腐蚀由腐蚀坑开始逐渐扩展,腐蚀面趋于基本一致后出现新的腐蚀坑,继续腐蚀;在最初的100 h,腐蚀速率变化剧烈.

To understand salt spray corrosion behavior and corrosion mechanism,the resistance of salt sprays corrosion for a Fe-based alloy 30Cr2Ni4MoV used in ship had been studied in the paper.The surface and section of samples corroded for different times,the corrosion products,the corrosion weight loss and corrosion ratio had been analyzed.The result showed that after corrosion 400 h,the surface of samples had been covered with corrosion products,and some corrosion products had separated from the substrate.The main component of corrosion product was FeO（OH）.The corrosion of 30Cr2Ni4MoV started form the corrosion pits,and then extended.While the corrosion extent of samples tended to be same,new corrosion pits appeared,and corrosion continued.In the first 100 h,the corrosion rate changed greatly.