期刊
PROGRESS IN ORGANIC COATINGS
卷 158, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.porgcoat.2021.106384
关键词
Zinc cations; Surface pretreatment; Mild steel; Silane coating; Corrosion
This study investigated the effect of adding zinc cations to acid pretreatment solution on the subsequent corrosion protection of mild steel by silane coatings. The presence of zinc cations was found to significantly increase the polarization resistance and reduce oxidation and corrosion attacks on the steel surface. Additionally, a complex was formed between Zn2+ cations and the organic inhibitor, as revealed by Raman spectroscopy.
Surface pretreatment is a key influential parameter on the protective function of silane coatings. The present study considers examining the effect of zinc cations addition to acid pretreatment solution on subsequent silane coating corrosion protection on mild steel. The electrochemical properties of subsequent silane coating on pretreated plates were assessed by electrochemical impedance spectroscopy and polarization measurements. The polarization resistance increased approximately two times in the presence of 3 g.L- 1 zinc cations, which agreed with electrochemical impedance spectroscopy data. Energy-dispersive X-ray spectroscopy (EDS) detected 3.13 wt % Zn on the zinc cation-pretreated substrate. Field emission scanning electron microscopy revealed surface morphological changes of pretreated samples in the presence of zinc cations. Contact angle, atomic force microscopy, grazing incidence X-ray diffraction, and EDS tests on the surface of pretreated samples evidenced that zinc cations reduced the oxidation and corrosion attacks on the steel surface. Raman spectroscopy revealed formation of a complex between Zn2+ cations and the organic inhibitor.
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