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Title: Characterization and Properties of Micro-arc Composite Ceramic Coatings on Magnesium Alloys

Abstract

Magnesium alloys are of growing interest for many industrial applications due to their favorable strength-to-weight ratio and excellent cast ability. However, one of the limiting factors in the use of magnesium on production vehicles is its poor corrosion resistance. Micro-arc Composite Ceramic (MCC) coatings on AZ91D magnesium alloys were prepared in combination with Micro-arc Oxidation (MAO) and electrophoresis technologies. The microstructure, corrosion resistance, abrasion resistance, stone impact resistance, thermal shock resistance and adhesion of MCC coating were studied, respectively. The surface and cross-section morphologies of MAO and MCC coating showed that the outer organic coating filled the holes on the surface of the MAO coating. It acted as a shelter on the MAO coating surface when the MCC coatings were exposed to corrosive environments. The corrosion resistance of the MCC coating was characterized by a copper-accelerated acetic acid salt spray test. The testing results showed that the creep back from scribe lines was less than 1mm and completely fit the evaluation standard. The composite structure of the MCC coating vastly improved the corrosion resistance of Mg alloys. According to testing standards, the resistance to abrasion, stone impact resistance, thermal shock resistance and adhesion of MCC coatings completely met the evaluationmore » standard requirements. The MCC coated AZ91D magnesium alloys possessed excellent properties; this is a promising corrosion and wear resistance surface treatment technology on magnesium alloys for production vehicles.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1239499
Report Number(s):
PNNL-SA-98854
VT0505000
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Conference
Resource Relation:
Conference: 70th Annual World Magnesium Conference, May 19-21, 2013, Xi'an, China
Country of Publication:
United States
Language:
English
Subject:
magnesium coatings micro-arc corrosion

Citation Formats

Zhang, Long, Jiang, Bailing, Ge, Yanfeng, Nyberg, Eric A., and Liu, Ming. Characterization and Properties of Micro-arc Composite Ceramic Coatings on Magnesium Alloys. United States: N. p., 2013. Web.
Zhang, Long, Jiang, Bailing, Ge, Yanfeng, Nyberg, Eric A., & Liu, Ming. Characterization and Properties of Micro-arc Composite Ceramic Coatings on Magnesium Alloys. United States.
Zhang, Long, Jiang, Bailing, Ge, Yanfeng, Nyberg, Eric A., and Liu, Ming. 2013. "Characterization and Properties of Micro-arc Composite Ceramic Coatings on Magnesium Alloys". United States.
@article{osti_1239499,
title = {Characterization and Properties of Micro-arc Composite Ceramic Coatings on Magnesium Alloys},
author = {Zhang, Long and Jiang, Bailing and Ge, Yanfeng and Nyberg, Eric A. and Liu, Ming},
abstractNote = {Magnesium alloys are of growing interest for many industrial applications due to their favorable strength-to-weight ratio and excellent cast ability. However, one of the limiting factors in the use of magnesium on production vehicles is its poor corrosion resistance. Micro-arc Composite Ceramic (MCC) coatings on AZ91D magnesium alloys were prepared in combination with Micro-arc Oxidation (MAO) and electrophoresis technologies. The microstructure, corrosion resistance, abrasion resistance, stone impact resistance, thermal shock resistance and adhesion of MCC coating were studied, respectively. The surface and cross-section morphologies of MAO and MCC coating showed that the outer organic coating filled the holes on the surface of the MAO coating. It acted as a shelter on the MAO coating surface when the MCC coatings were exposed to corrosive environments. The corrosion resistance of the MCC coating was characterized by a copper-accelerated acetic acid salt spray test. The testing results showed that the creep back from scribe lines was less than 1mm and completely fit the evaluation standard. The composite structure of the MCC coating vastly improved the corrosion resistance of Mg alloys. According to testing standards, the resistance to abrasion, stone impact resistance, thermal shock resistance and adhesion of MCC coatings completely met the evaluation standard requirements. The MCC coated AZ91D magnesium alloys possessed excellent properties; this is a promising corrosion and wear resistance surface treatment technology on magnesium alloys for production vehicles.},
doi = {},
url = {https://www.osti.gov/biblio/1239499}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue May 21 00:00:00 EDT 2013},
month = {Tue May 21 00:00:00 EDT 2013}
}

Conference:
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