EFFECT OF NEGATIVE POTENTIAL ON COMPACTNESS OF PLASMA ELECTROLYTIC OXIDATION COATINGS ON MAGNESIUM ALLOY AZ31B BY ELECTROCHEMICAL IMPEDANCE SPECTRUM

Journal of Chinese Society for Corrosion and protection

2012, Vol. 32

Issue (6): 467-472 DOI:

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EFFECT OF NEGATIVE POTENTIAL ON COMPACTNESS OF PLASMA ELECTROLYTIC OXIDATION COATINGS ON MAGNESIUM ALLOY AZ31B BY ELECTROCHEMICAL IMPEDANCE SPECTRUM

GUO Quanzhong¹, ZHANG Wei¹, DU Keqin¹, WANG Rong²

1. State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy ofScience, Shenyang 110016

2. The Ningbo Branch of Ordnance Science of China, Ningbo 315103

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Abstract

The effect of negative potential of bipolar pulse on the compactness of plasma electrolytic oxidation (PEO) coating on magnesium alloy is not definite nowadays. PEO coatings on magnesium alloy AZ31B were prepared by respectively using unipolar and bipolar pulse whose negative potential was changed while positive potential was at several levels. In order to analyze the effect of negative potential on compactness of PEO coatings, the samples were examined by electrochemical impedance spectrum (EIS) and scanning electron microscope (SEM) to study the variation of equivalent circuit data and the change of macrostructure. The results have shown that negative potential plays an important role on compactness of PEO coatings and suitable negative potential can increase the compactness of coatings. The negative potential of pulse which can prepare compact coatings is always 30 V and stays the same at several levels of positive potential.

Key words: magnesium alloy plasma electrolytic oxidation negative potential electrochemical impedance spectrum compactness

Received: 28 November 2011

ZTFLH:

TG174.4

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GUO Quanzhong, ZHANG Wei, DU Keqin, WANG Rong. EFFECT OF NEGATIVE POTENTIAL ON COMPACTNESS OF PLASMA ELECTROLYTIC OXIDATION COATINGS ON MAGNESIUM ALLOY AZ31B BY ELECTROCHEMICAL IMPEDANCE SPECTRUM. Journal of Chinese Society for Corrosion and protection, 2012, 32(6): 467-472.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2012/V32/I6/467

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