XPS characterization of passive films formed on mild steels in bicarbonate medium

Química Nova

Brett, Christopher Michael Ashton¹  Alves, Valéria Almeida¹  Departamento de Química, Lisboa, Portugal¹  Faculdades Federais Integradas de Diamantina, Diamantina, Brasil¹  Montemor, Maria de Fátima¹  Universidade de Coimbra, Coimbra, Portugal¹ 

关键词: passive film;    steel;    XPS.;   

DOI  :  10.1590/S0100-40422005000200007

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

Passive films formed in bicarbonate solutions on carbon steel, chromium steel and high speed steel have been characterized by XPS. The passive films formed on chromium and high speed steels showed superior protective properties than those formed on carbon steel. It was confirmed by XPS that the steel composition influences the passive film composition. Chromium oxide and hydroxide, as well as molybdenum and tungsten oxides and hydroxides are present in the passive film of chromium steel and high speed steel, respectively, besides iron oxide and hydroxide. The more complex composition of the oxide film on high speed steel explains its electrochemical behaviour and highest corrosion resistance.

【 授权许可】

Unknown