Abstract
A dense Cr2O3/Al2O3 composite coating was fabricated on 321L stainless steel by electrodepositing an Al2O3 layer on a Cr2O3 coating. The composition, structure, and properties of the obtained ceramic coating were investigated. The results showed that Al2O3 fully infiltrated the Cr2O3 coating and significantly improved the compactness of the ceramic coating by filling in the pores and cracks between the Cr2O3 grains. The composite ceramic coating was heat-treated at 750 °C and exhibited a high microhardness of 219.4 HV500g, a bonding strength of 46.5 MPa, and excellent anti-corrosion and deuterium permeation suppression properties.
Highlights
Ceramic coatings on the surface of metal materials have wide application in power and refractory industries against chemical corrosion, oxidation, abrasive wear, and tritium permeation.Cr2 O3 is regarded as an effective protective coating due to its thermal stability, chemical inertness, low permeability of hydrogen isotopes, and good adhesion to metal substrates
Cr2 O3 and its composite ceramic coatings have been made by magnetron sputtering [1,2], thermal spray [3,4,5], electrodeposition [6], atomic layer deposition, and evaporation [7]
Wang et al [8] covered a Cr2 O3 coating with aluminum phosphate by dip-coating, which exhibited a good resistance to corrosion and improved tritium resistant performance
Summary
Ceramic coatings on the surface of metal materials have wide application in power and refractory industries against chemical corrosion, oxidation, abrasive wear, and tritium permeation. Cr2 O3 and its composite ceramic coatings have been made by magnetron sputtering [1,2], thermal spray [3,4,5], electrodeposition [6], atomic layer deposition, and evaporation [7]. Among these methods, electrodeposition is suitable for fabricating ceramic coatings on metal substrates because of its capability of complex geometries, possibility of coating different substrate materials, and easy operation. The interface combination was poor, and cracks formed as a result of the heterogeneity of the coating and sealing materials. The microstructures and properties of the composite coating were investigated in detail
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