Preparation of PEO/silane composite coating on AZ31 magnesium alloy and investigation of its properties

被引：35

作者：

Parichehr, Rasoul ^{[1
]}

Dehghanian, Changiz ^{[1
]}

Nikbakht, Aida ^{[1
]}

机构：

[1] Univ Tehran, Coll Engn, Sch Met & Mat Engn, Tehran, Iran

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2021年 / 876卷

关键词：

Magnesium; Plasma electrolyte oxidation; Silane; Composite coating; PLASMA ELECTROLYTIC OXIDATION; SOL-GEL COATINGS; CORROSION-RESISTANCE; HYBRID COATINGS; SILANE COATINGS; ALUMINUM-ALLOY; MG ALLOY; PEO; BEHAVIOR; AZ91D;

D O I：

10.1016/j.jallcom.2021.159995

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A composite Plasma Electrolytic Oxidation together with silane (PEO/silane) was deposited on AZ31 magnesium alloy, and the coating properties were compared to PEO and silane single-layer coatings individually. SEM, AFM, XRD, FT-IR (transmission and ATR), and pull off tests were utilized to characterize the coatings and evaluate them as pretreatment for an epoxy coating. The results showed that the PEO/silane coating improved the adhesion strength of the epoxy coating. EIS, EDS, and SEM were used to investigate the corrosion resistance of the coatings and their degradation mechanism. The results revealed that the PEO/silane coating had superior corrosion resistance in comparison with both the PEO and silane single-layer coatings. The corrosion resistance of the PEO and silane coatings decreased and they degraded during 168 h of immersion in 3.5% NaCl, however; the PEO/silane coating maintained its corrosion resistance and did not undergo any degradation. (c) 2021 Elsevier B.V. All rights reserved.

引用

页数：15

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