通过失重法和电化学法以及表面膜XPS分析，研究了NaNO3对含Cl-衣康酸介质中316L不锈钢的缓蚀性能。结果表明：溶液中一定量的NaNO3可使不锈钢的点蚀电位显著提高，有效地抑制点蚀，缓蚀效率达81—95%；温度、Cl-溶度及Fe3+的存在等因素对缓蚀性能有一定影响；NaNO3通过竞争吸附机制起缓蚀作用。
By weight loss and electrochemical measurements and XPS analysis,the inhibition effect of NaNO3 for 316L stainless steel in Cl- containing itaconic acid media was investigated.The results showed that the pitting corrosion of the steel in the media could be prevented effectively in the presence of some amounts of NaNO3,which could raise the critical pitting potential up to the transpassive potential so as to result in a superior pitting resistance.The competitive adsorption between NO3- and Cl- on the steels surface might be a main mechanism for inhibition.In view of the dual functions of NaNO3 as an inhibitor and as a nitrogenous source necessary for the fermentation process,it is feasible for NaNO3 to be recommended for use in the production of itaconic acid by fermentation
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