Accessible Unlicensed Requires Authentication Published by De Gruyter October 30, 2018

Physical and electrochemical characteristics of low pressure cold sprayed aluminium composite coating on magnesium substrate

Guosheng Huang

Abstract

A high Al2O3 content (40 wt.%) reinforced Al coating was deposited on AZ91D magnesium alloy through the low-pressure cold spraying technique. It was found that the low-pressure cold spraying method could deposit a high quality aluminium coating on AZ91D magnesium alloy with bonding strength ranging from 17.7 MPa to 25.2 MPa. The average porosity in this case is about 2.6 %, and the alumina particles are distributed uniformly. Electrochemical tests revealed that the low-pressure cold sprayed Al + 40 % Al2O3 coating has better corrosion resistance than magnesium in neutral 3.5 wt.% sodium chloride solution. Low-pressure cold sprayed aluminium coating can separate the magnesium substrate from a corrosive electrolyte, which can significantly improve the anticorrosion performance of the AZ91D magnesium alloy.


*Correspondence address, Guosheng Huang, Ph.D., Science and Technology on Marine Corrosion and Protection Laboratory, Luoyang Ship Material Research Institute, Aoshanwei Town, Wenhai Road, Qingdao, 266101, P.R. China, Tel.: +86-532-68725121, Fax: +86-532-68725100, E-mail:

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Received: 2018-02-24
Accepted: 2018-06-06
Published Online: 2018-10-30
Published in Print: 2018-11-12

© 2018, Carl Hanser Verlag, München