Corrosion behaviour of iron and AISI 304 stainless steel in tungstate aqueous solutions containing chloride

Journal of the Brazilian Chemical Society

Azambuja, Denise S.¹  Martini, Emilse M. A.¹  Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil¹  Müller, Iduvirges L.¹  Instituto de Química¹ 

关键词: tungstate;    iron;    stainless steel;    pitting;   

DOI  :  10.1590/S0103-50532003000400013

学科分类：化学（综合）

来源: SciELO

【 摘 要 】

The corrosion behavior of iron and AISI 304 stainless steel in aqueous tungstate solutions containing chloride ion was investigated by cyclic voltammetry, open circuit measurements and impedance spectroscopy. The obtained results point out that the inhibitive performance of tungstate depends on the presence of dissolved oxygen, being strongly related to the adsorption of this anion on the surface of the electrode. Under anodic polarization, at low sweep rate and electrode rotation the passive film is more stable and the corrosion rate decreases. At the open circuit potential, the EIS data have clearly demonstrated that for longer immersion times the tungstate inhibitive action is considerably improved.

【 授权许可】

Unknown