Corrosion and wear of PEO coated AZ91/SiC composites

B. Mingo; R. Arrabal; M. Mohedano; A. Pardo; E. Matykina

doi:10.1016/j.surfcoat.2016.10.041

Corrosion and wear of PEO coated AZ91/SiC composites

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

Universidad Complutense de Madrid

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Abstract

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 β-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.

Original language	English
Pages (from-to)	1023-1032
Number of pages	10
Journal	Surface and Coatings Technology
Volume	309
Early online date	15 Oct 2016
DOIs	https://doi.org/10.1016/j.surfcoat.2016.10.041
Publication status	Published - 15 Jan 2017

Keywords

Corrosion
Magnesium composite
SKPFM
Wear

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10.1016/j.surfcoat.2016.10.041

Corrosion and wear of PEO coated AZ91SiC composites_Accepted author manuscript, 38.7 KBLicence: CC BY-NC-ND

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title = "Corrosion and wear of PEO coated AZ91/SiC composites",

abstract = "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 β-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.",

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AU - Mingo, B.

AU - Arrabal, R.

AU - Mohedano, M.

AU - Pardo, A.

AU - Matykina, E.

PY - 2017/1/15

Y1 - 2017/1/15

N2 - 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 β-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.

AB - 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 β-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.

KW - Corrosion

KW - Magnesium composite

KW - SKPFM

KW - Wear

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JO - Surface and Coatings Technology

JF - Surface and Coatings Technology

SN - 0257-8972

ER -

Corrosion and wear of PEO coated AZ91/SiC composites

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Keywords

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