Influence of surface pre-treatment on the deposition and corrosion properties of hydrophobic coatings on a magnesium alloy. (November 2016)

• Record Type: Journal Article
• Authors: Zhang, Yufen; Blawert, Carsten; Tang, Shawei; Hu, Jin; Mohedano, Marta; Zheludkevich, Mikhail L.; Kainer, Karl Ulrich
• Is Part Of: Corrosion science. Volume 112(2016)
• Page Start: 483
• Page End: 494
• Publication Date: 2016-11
• Subjects: A. Magnesium -- B. EIS -- B. Polarization -- B. SEM -- B. XRD; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2016.08.013
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: Pre-treatment prior to hydrophobic coating affects on the formation and growth of coating. Pre-treatments affect the thickness and morphology of coating rather than composition. Pre-treatment layer plays an important role in corrosion resistance of coated specimens. Abstract: Calcium stearate based hydrophobic coatings were deposited on pre-treated Mg alloy substrates. The influence of four different pre-treatments including plasma electrolytic oxidation (as prepared and etched), anodizing and hydrothermal treatment was studied. The results indicate that the pre-treatments have strong influences on the morphology, thickness, and wettability of the coatings, without affecting their phase composition. The coating system based on the etched plasma electrolytic oxidation pre-treatment shows the best corrosion resistance in a simulated body fluid. The superior protection effect is mainly related to the differences in the morphologies and thickness of the pre-treatment layers.