Effect of laser surface texturing depth and pattern on the bond strength and corrosion performance of phosphate conversion coating on magnesium alloy

•The depth and pattern of LST affect the deposition the of PC coating.•LST treatment can improve the bond strength of PC coating on magnesium alloy.•The coating prepared with shallow groove and mesh texture pretreatment shows superior corrosion resistance. In this study, the influence of laser surfa...

Full description

Saved in:
Bibliographic Details
Published in:Optics and laser technology 2022-09, Vol.153, p.108164, Article 108164
Main Authors: Liu, Huaile, Tong, Zhaopeng, Gu, Jiayang, yang, Da, Liu, Chang, Wang, Xiaoyang, Ren, Xudong
Format: Article
Language:English
Subjects:
Bond strength
Bonding strength
Corrosion resistance
Grooves
Laser surface texturing
Magnesium alloy
Magnesium base alloys
Phosphate conversion coating
Pretreatment
Surface roughness
Texture
Texturing
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:•The depth and pattern of LST affect the deposition the of PC coating.•LST treatment can improve the bond strength of PC coating on magnesium alloy.•The coating prepared with shallow groove and mesh texture pretreatment shows superior corrosion resistance. In this study, the influence of laser surface texturing (LST) depth and pattern on the bond strength and corrosion performance of phosphate conversion (PC) coating deposited on magnesium alloy has been investigated. The results reveal that high surface roughness and high specific area induced by LST pretreatment can promote the deposition of PC coating. Groove texture with proper depth can greatly reduce the shedding rate and improve the bond strength of PC coating, comparing to that of the as-received coating. Increasing the ratio of texture area with adopting mesh texture can further improve the bond strength of the coating. Electrochemical measurements demonstrate the coatings with shallow groove and mesh texture pretreatment endow a prominent improvement in corrosion resistance for the AZ31 alloy and provide long-term protection for 100 h in Hanks’ solution.
ISSN:0030-3992
1879-2545
DOI:10.1016/j.optlastec.2022.108164