合金元素含量对AH32钢在含H_2S潮湿气氛中腐蚀行为的影响  

Influence of Alloying Element Contents on Corrosion Properties of AH32 Steel in Wet Atmosphere Containing H_2S

作　　者：徐小连[1] 高鹏[1] 艾芳芳[1] 叶其斌[1] 陈义庆[1] 李琳[1] 钟彬[1] 肖宇[1] 

机构地区：[1]鞍钢股份有限公司技术中心,鞍山114009

出　　处：《腐蚀与防护》2013年第12期1103-1107,共5页Corrosion & Protection

摘　　要：针对不同合金元素含量的AH32系列试验钢,在模拟油船货油舱上顶板及梁架所处的含H_2S海洋潮湿气氛环境中进行腐蚀模拟试验。利用SEM、EDS和XRD等手段,研究了合金元素含量对AH32钢腐蚀行为的影响并探讨了其腐蚀机制。结果表明,在该试验环境中,镍、铬、铜、钒、铌等合金元素含量较高的AH32钢在短时间内腐蚀速率较高,但随着试验时间的延长呈快速下降趋势,而合金含量较低的AH32钢腐蚀速率下降趋势较缓;高合金含量的AH32钢耐蚀性优于低合金含量的AH32钢;不同合金含量的AH32钢的主要腐蚀产物均为FeS_(1-x)、FeS、Fe_3O_4、α-FeOOH、β-FeOOH和γ-FeOOH;其腐蚀机理为薄液膜下受H_2S和O_2扩散控制的电化学腐蚀,并且随着腐蚀时间的延长,试样表面的HS去极化过程逐渐占据主导。The effects of alloy element eontents on corrosion properties of the AH32 steel in the briny wet atmosphere containing H2S simulating the cargo oil tank corrosion environment were investigated by corrosion rate measurement, SEM, EDS and XRD. The results show that the corrosion rate of AH32 steel with higher alloy content was higher in the initial stage , and then decreased rapidly after 21 d due to higher contents of Ni, Cr, Cu, V and Nb. The corrosion resistance of the higher alloying AH32 steel was better than that of the lower alloying AH32 steel. The main corrosive products on the surface of the both AH32 steels with higher and lower alloy content are identified as FeS1-x, FeS, Fe3O4, a-FeOOH, β-FeOOH, and 7-FeOOH. The electrochemical corrosion controlled by the diffusion of H2S and 02 under the liquid film was the main corrosion mechanism. HS depolarizing process became increasingly dominant with the increase of corrosion time.

关 键 词：AH32钢 合金含量 含H.S潮湿气氛 腐蚀行为 

分 类 号：TG172[金属学及工艺—金属表面处理]