摘要
用慢应变速率试验(SSRT)法研究了四甲基碘化铵(TMAI)、四丁基碘化铵(TBAI)、碘化钾(KI)和碘对AISI 321不锈钢在0.5 mol/L NaCl+0.5 mol/L HCl溶液中的应力腐蚀开裂(SCC)的缓蚀作用。电化学测试表明,随着应变量的增加,钢的腐蚀电流密度先快速增加,然后在某一数值附近波动;在含有I^-和I_2的溶液中腐蚀电流密度的增加显著减慢。I^-和I_2对SCC的缓蚀作用主要是由于它们抑制了腐蚀过程的阳极反应,并且降低了应变对腐蚀电流密度的加速作用。
The SCC behaviour of AISI 321 SS in 0.5 mol/L NaC1 + 0.5 mol/L HCl solution and the inhibition effects of some iodides and iodine on SCC were studied by Slow Strain Rate Test (SSRT). The iodides studied include tetramethyl ammonium iodide (TMAI), tetrabutyl ammonium iodide (TBAI) and KI. It was found that the additives could effectively inhibit the SCC of AISI 321 SS in the solution and the inhibition effects of the iodides were mainly due to the role of iodide ion. Electrochemical measurements show that the corrosion current density of the steel increases rapidly at first and then fluctuates around a certain value as the strain level is increasing. In the solutions containing I^-or I_2 the increase of corrosion current density is markedly less than that in the blank solution. It is concluded that inhibition effects of both I^- and I_2 on the SCC of the steel could be attributed to the depression of the anodic reaction involved in corrosion process and the reduction of the accelerating effect of strain on corrosion current density.
出处
《中国腐蚀与防护学报》
CAS
CSCD
1993年第3期199-205,共7页
Journal of Chinese Society For Corrosion and Protection
基金
国家自然科学基金资助课题
