Formation of a Spinel Coating on AZ31 Magnesium Alloy by Plasma Electrolytic Oxidation

被引：12

作者：

Sieber, Maximilian ^{[1
]}

Simchen, Frank ^{[1
]}

Scharf, Ingolf ^{[1
]}

Lampke, Thomas ^{[1
]}

机构：

[1] Tech Univ Chemnitz, Mat & Surface Engn Grp, D-09107 Chemnitz, Germany

来源：

JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE | 2016年 / 25卷 / 03期

关键词：

corrosion; inorganic coatings; magnesium; plasma electrolytic oxidation; CORROSION-RESISTANCE; MICROARC OXIDATION; SILICATE; BEHAVIOR; NAALO2; WEAR;

D O I：

10.1007/s11665-016-1917-7

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Plasma electrolytic oxidation (PEO) is a common means for the surface modification of light metals. However, PEO of magnesium substrates in dilute electrolytes generally leads to the formation of coatings consisting of unfavorable MgO magnesium oxide. By incorporation of electrolyte components, the phase constitution of the oxide coatings can be modified. Coatings consisting exclusively of MgAl2O4 magnesium-aluminum spinel are produced by PEO in an electrolyte containing hydroxide, aluminate, and phosphate anions. The hardness of the coatings is 3.5 GPa on Martens scale on average. Compared to the bare substrate, the coatings reduce the corrosion current density in dilute sodium chloride solution by approx. one order of magnitude and slightly shift the corrosion potential toward more noble values.

引用

页码：1157 / 1162

页数：6

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