Corrosion and wear of PEO coated AZ91/SiC composites

SURFACE & COATINGS TECHNOLOGY

卷:309

Article

Mingo, B.¹  Arrabal, R.¹  Mohedano, M.¹  Pardo, A.¹  Matykina, E.¹ 

[1] Univ Complutense, Fac Ciencias Quim, Dept Ciencia Mat, E-28040 Madrid, Spain

关键词: Magnesium composite;    Corrosion;    Wear;    SKPFM;   

DOI  :  10.1016/j.surfcoat.2016.10.041

来源: Elsevier

【 摘 要 】

In this work, corrosion and wear resistance of uncoated and PEO coated AZ91/SiC/0-10p composites manufactured by semisolid processing is evaluated by corrosion tests in saline solution and ball-on-disc tests. AZ91/SiC composites show a globular microstructure with SiC clusters located at the interglobular regions. PEO coatings reveal a trilayered structure with thicker, less porous and softer regions at the locations of SiC clusters. Corrosion rate increases with increasing the volume fraction of reinforcement, which shows a cathodic activity and disrupts the continuity of the (3-phase network. PEO improves the corrosion resistance,but it is also negatively influenced by the presence of the reinforcement. Tribological tests show a positive effect of the reinforcement on uncoated materials, whereas an opposite effect is found on PEO coated materials, probably due to the detachment of SiC particles from the coating. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

Free