The role of WO42− on surface passivation for Q235 carbon steel in tungstate solution
Anti-Corrosion Methods and Materials
ISSN: 0003-5599
Article publication date: 3 August 2020
Issue publication date: 30 September 2020
Abstract
Purpose
The purpose of this work is to reveal the mechanism of WO42− on surface passivation for Q235 carbon steel in tungstate solution.
Design/methodology/approach
In Na2WO4 solutions with the different concentrations of WO42−, the spontaneous passivation occurred on the surface of Q235 carbon steel when the concentration of WO42− was up to 0.13 mmol/L, which was attributed to the formations of the inner deposition film and the outer adsorption film on the Q235 surface under the action of WO42−.
Findings
The inner deposition film presented a two-layer microstructure: the inside layer was composed of Fe2O3 mainly, and the outside layer comprised Fe(OH)2•nH2O, Fe(OH)3•nH2O, FeWO4 and Fe2(WO4)3.
Originality/value
Both FeWO4 and Fe2(WO4)3 repaired the defects in the outside layer of the inner deposition film; however, the outer adsorption film played a more important role in the surface passivation than the inner deposition film did.
Keywords
Acknowledgements
The work is supported by the National Natural Science Foundation of China (Contract 51601133), the Graduate innovative Fund of Wuhan Institute of Technology (Contract CX2018013), the Middle-aged and Young University Teachers’ Basic Ability Promotion Project of Guangxi (Contract 2019KY0612) and the Science Research Project of High Level Talents in Yulin Normal University (Contract G2019ZK53).
Citation
Chen, Y., Zhang, P., Zhou, Y. and Yan, F. (2020), "The role of WO42− on surface passivation for Q235 carbon steel in tungstate solution", Anti-Corrosion Methods and Materials, Vol. 67 No. 5, pp. 483-489. https://doi.org/10.1108/ACMM-01-2020-2254
Publisher
:Emerald Publishing Limited
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