Effect of Pre-treatment on Corrosion Performance of AZ31B Magnesium Alloy Panel

2010-01-0725

04/12/2010

Event
SAE 2010 World Congress & Exhibition
Authors Abstract
Content
AZ31B Mg sheet is being considered for automotive applications. This study investigates the effect of pre-treatments, such as heat-treatments and surface treatments, on the corrosion performance of AZ31B sheet, with a goal of learning which pre-treatment can improve corrosion resistance of the sheet material in production. It is found that the heat-treatment and oxidation during a warm and hot forming (WHF) process will not deteriorate the corrosion performance of the AZ31B sheet; polishing and acid etching can clean the surface and significantly increase the corrosion resistance, but corrosion can be accelerated by sandblasting which contaminates the surface. The change in corrosion performance can be associated with surface cleaning or contamination of the sheet by these pre-treatments. Furthermore, the influence of a pre-treatment on the uncoated AZ31B sheet may affect its corrosion behavior after coating. According to this study, conventional sandblasting is not recommended to remove damaged coatings and corrosion products on a Mg alloy part for coating repair. If used, deep acid cleaning should follow to eliminate the detrimental effect of sandblasting.
Meta TagsDetails
DOI
https://doi.org/10.4271/2010-01-0725
Pages
11
Citation
Song, G., and Xu, Z., "Effect of Pre-treatment on Corrosion Performance of AZ31B Magnesium Alloy Panel," SAE Technical Paper 2010-01-0725, 2010, https://doi.org/10.4271/2010-01-0725.
Additional Details
Publisher
Published
Apr 12, 2010
Product Code
2010-01-0725
Content Type
Technical Paper
Language
English