Corrosion behaviour of laser powder bed fused bulk pure magnesium in hank's solution. (15th August 2019)

• Record Type: Journal Article
• Authors: Niu, Xiaomiao; Shen, Hongyao; Fu, Jianzhong; Yan, Jinwen; Wang, Yu
• Is Part Of: Corrosion science. Volume 157(2019)
• Page Start: 284
• Page End: 294
• Publication Date: 2019-08-15
• Subjects: Additive manufacturing -- Laser powder bed fusion -- Magnesium -- Microstructure -- Electrochemical measurement -- Mass loss; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2019.05.026
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: The processing parameters impacted on the relative density and mechanical integrity of LPBFed Mg. The corrosion resistance of LPBFed Mg cannot be assessed by volume of defects alone. Loosely fused materials and un-melted powder lowered the corrosion resistance of LPBFed Mg. Sufficient energy input should be used to obtain reasonable corrosion resistance of LPBFed Mg. Abstract: Laser powder bed fusion (LPBF) can be used to additively manufacture magnesium(Mg)-based biodegradable materials. However, the influence of the processing parameters on the microstructure and consequent corrosion behaviour of bulk pure Mg fabricated by LPBF needs to be investigated. Electrochemical measurements and mass loss tests were carried out to evaluate the corrosion resistance of Mg components manufactured by LPBF. It was found that the laser-introduced defects initiated localised corrosion and lowered the overall corrosion resistance. Loosely fused Mg materials had high corrosion susceptibility. Hence, the processing parameters should be carefully selected to obtain favourable corrosion resistance of Mg manufactured by LPBF.