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Passivity of stainless steel in sulphuric acid under chemical oxidation

机译：化学氧化下硫酸中不锈钢的钝化性

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摘要

The main purpose of the present work was to study the passivity of stainless steel in sulphuric acid under chemical oxidation with H2O2 solution. Potentiodynamic polarisation and open circuit potential (OCP) measurements indicated that H2O2 facilitates the increase of OCP of stainless steel which shifts from active region into passive region. The X-ray photoelectron spectroscopy results suggested that a passive film, composed of oxyhydroxides, Cr2O3, Cr(VI) species, NiO, and sulphate (FeSO4, Cr-2(SO4)(3)center dot xH(2)O), is achieved after H2SO4-H2O2 passivation. The passive mechanism under H2O2 oxidation was discussed and the corrosion resistance of passive film was compared with that of the passive films produced by HNO3 passivity and H2SO4 potentiostatic passivity. The results of electrochemical impedance spectroscopy, cyclic voltammetry, and anodic polarisation experiments confirmed that the chemical oxidation with H2O2 solution is capable of improving the corrosion resistance of stainless steel significantly and the passive film is more stable than those produced by other passivating methods.
机译：本工作的主要目的是研究用H2O2溶液在化学氧化下硫酸中不锈钢的钝化性。电位动力学偏振和开路电位（OCP）测量表明，H2O2促进了从活性区域转移到被动区域中的不锈钢OCP的增加。 X射线光电子能谱结果表明，由羟基氧化物，Cr2O3，Cr（VI）物种，NiO和硫酸酯组成的无源膜（FeSO4，Cr-2（SO 4）（3）中心点XH（2）O），在H2SO4-H2O2钝化后实现。讨论了H 2 O 2氧化下的无源机制，并将无源膜的耐腐蚀性与通过HNO3被动和H 2 SO 4稳态的被动性产生的无源膜的耐腐蚀性。电化学阻抗谱，循环伏安法和阳极偏振实验的结果证实，使用H 2 O 2溶液的化学氧化能够显着改善不锈钢的耐腐蚀性，并且无源膜比其他钝化方法产生的耐热膜更稳定。

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