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Metals 2016, 6(3), 44; doi:10.3390/met6030044

Effect of Synthesizing Temperature on Microstructure and Electrochemical Property of the Hydrothermal Conversion Coating on Mg-2Zn-0.5Mn-Ca-Ce Alloy

1
College of Mechanics and Materials, Hohai University, Nanjing 210098, China
2
Department of Material Science and Engineering, North Carolina State University, Raleigh, NC 27606, USA
3
School of Materials Science and Engineering, Southeast University, Nanjing 211100, China
4
Jiangsu Collaborative Innovation Center of Advanced Micro/Nano Materials & Equipment, Nanjing University of Science and Technology, Nanjing 210094, China
*
Authors to whom correspondence should be addressed.
Academic Editors: Vineet V. Joshi and Alan Meier
Received: 14 January 2016 / Revised: 6 February 2016 / Accepted: 15 February 2016 / Published: 25 February 2016
(This article belongs to the Special Issue Oxidation of Metals)
View Full-Text   |   Download PDF [3553 KB, uploaded 25 February 2016]   |  

Abstract

Mg(OH)2 conversion coatings were formed on an Mg-2Zn-0.5Mn-Ca-Ce alloy via hydrothermal method at three different synthesizing temperatures (160, 170 and 180 °C). The effect of synthesizing temperature on microstructure and electrochemical property of the coatings were systematically studied. With increasing synthesizing temperature, the coating became thicker due to the faster reaction and deposition of Mg(OH)2 on the α-Mg phase and secondary phases of the substrate Mg alloy. Internal micro-cracks were also generated in the higher-temperature synthesized coatings due to the increased shrinking stress, but the cross-cutting micro-cracks were suppressed. Benefiting from the improved barrier effect against penetration of corrosive medium, the higher-temperature synthesized thicker coating presented significantly enhanced electrochemical property and anti-corrosion efficiency in Hanks’ solution. View Full-Text
Keywords: conversion coating; synthesizing temperature; Mg alloy; microstructure; electrochemical property conversion coating; synthesizing temperature; Mg alloy; microstructure; electrochemical property
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Guo, G.; Song, D.; Jiang, J.; Ma, A.; Zhang, L.; Li, C. Effect of Synthesizing Temperature on Microstructure and Electrochemical Property of the Hydrothermal Conversion Coating on Mg-2Zn-0.5Mn-Ca-Ce Alloy. Metals 2016, 6, 44.

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