Anodic oxidation and sol-gel coatings for corrosion and wear protection of AM60B alloy

Abstract

In this paper a study on the corrosion and wear protection of AM60B magnesium alloy, by means of multilayer coating, is described. The coating mainly consists of a porous oxide layer MgO, produced by oxidation in microarc regime, and a single or multilayer top coat of SiO_x produced by sol-gel technique and deposited by either a dip or spray coating method. The anodic oxidation pretreatment improves the adhesion of the sol-gel layers, which seal the porosity of MgO and improve corrosion protection. Furthermore, the multilayer coating significantly improves AM60B wear resistance. Scanning electron microscopy and radiofrequency glow discharge optical emission spectroscopy were used to assess surface morphologies and in depth elemental profiles of the coatings. Electrochemical polarisation tests and wear tests were performed to evaluate the corrosion resistance behaviour and the wear resistance of the coated magnesium alloys.

Original language	English
Pages (from-to)	57-62
Number of pages	6
Journal	Transactions of the Institute of Metal Finishing
Volume	88
Issue number	1
DOIs	https://doi.org/10.1179/174591909X12596814696567
Publication status	Published - 1 Jan 2010
Externally published	Yes

Keywords

Anodic oxidation
Corrosion
Magnesium alloys
Sol-gel coatings
Wear

ASJC Scopus subject areas

Condensed Matter Physics
Surfaces and Interfaces
Mechanics of Materials
Metals and Alloys
Surfaces, Coatings and Films

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10.1179/174591909X12596814696567

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title = "Anodic oxidation and sol-gel coatings for corrosion and wear protection of AM60B alloy",

abstract = "In this paper a study on the corrosion and wear protection of AM60B magnesium alloy, by means of multilayer coating, is described. The coating mainly consists of a porous oxide layer MgO, produced by oxidation in microarc regime, and a single or multilayer top coat of SiOx produced by sol-gel technique and deposited by either a dip or spray coating method. The anodic oxidation pretreatment improves the adhesion of the sol-gel layers, which seal the porosity of MgO and improve corrosion protection. Furthermore, the multilayer coating significantly improves AM60B wear resistance. Scanning electron microscopy and radiofrequency glow discharge optical emission spectroscopy were used to assess surface morphologies and in depth elemental profiles of the coatings. Electrochemical polarisation tests and wear tests were performed to evaluate the corrosion resistance behaviour and the wear resistance of the coated magnesium alloys.",

keywords = "Anodic oxidation, Corrosion, Magnesium alloys, Sol-gel coatings, Wear",

author = "M. Bestetti and {Da Forno}, A. and Cavallotti, {P. L.} and P. Gronchi and F. Barlassina",

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AU - Bestetti, M.

AU - Da Forno, A.

AU - Cavallotti, P. L.

AU - Gronchi, P.

AU - Barlassina, F.

PY - 2010/1/1

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N2 - In this paper a study on the corrosion and wear protection of AM60B magnesium alloy, by means of multilayer coating, is described. The coating mainly consists of a porous oxide layer MgO, produced by oxidation in microarc regime, and a single or multilayer top coat of SiOx produced by sol-gel technique and deposited by either a dip or spray coating method. The anodic oxidation pretreatment improves the adhesion of the sol-gel layers, which seal the porosity of MgO and improve corrosion protection. Furthermore, the multilayer coating significantly improves AM60B wear resistance. Scanning electron microscopy and radiofrequency glow discharge optical emission spectroscopy were used to assess surface morphologies and in depth elemental profiles of the coatings. Electrochemical polarisation tests and wear tests were performed to evaluate the corrosion resistance behaviour and the wear resistance of the coated magnesium alloys.

AB - In this paper a study on the corrosion and wear protection of AM60B magnesium alloy, by means of multilayer coating, is described. The coating mainly consists of a porous oxide layer MgO, produced by oxidation in microarc regime, and a single or multilayer top coat of SiOx produced by sol-gel technique and deposited by either a dip or spray coating method. The anodic oxidation pretreatment improves the adhesion of the sol-gel layers, which seal the porosity of MgO and improve corrosion protection. Furthermore, the multilayer coating significantly improves AM60B wear resistance. Scanning electron microscopy and radiofrequency glow discharge optical emission spectroscopy were used to assess surface morphologies and in depth elemental profiles of the coatings. Electrochemical polarisation tests and wear tests were performed to evaluate the corrosion resistance behaviour and the wear resistance of the coated magnesium alloys.

KW - Anodic oxidation

KW - Corrosion

KW - Magnesium alloys

KW - Sol-gel coatings

KW - Wear

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