Influence of thermal spraying parameters on the corrosion resistance of aluminium oxide coatings deposited on steel 1020

3rd International Meeting for Researchers in Materials and Plasma Technology; 1st Symposium on Nanoscience and Nanotechnology

物理学;材料科学

Salas, Y.^1 ; Vera, E.^2 ; Moreno, M.^2 ; Pineda, Y.^2

Universidad Antonio Nariño, Bogotá, Colombia^1

Universidad Pedagógica y Tecnológica de Colombia (UPTC), Tunja, Colombia^2

关键词: Coating thickness;    Commercial powders;    Corrosion current;    Electrochemical techniques;    Linear polarization resistance;    Potentiodynamic curve;    Spraying depositions;    Spraying parameters;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/687/1/012105/pdf
DOI  :  10.1088/1742-6596/687/1/012105

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Parameters required for the preparation of coatings of aluminium oxide deposited on AISI 1020 steels were determined according to their thickness and type of flame to differentiate their behaviour against corrosion. Commercial powders were used by the method of thermal spraying deposition. The coatings were analysed by OM (optical microscopy), the thickness was measured by means of a coating thickness gauge and electrochemical techniques variables measured was the Linear Polarization Resistance (LPR) and approximation Tafel potentiodynamic curves. The corrosion current for steel 1020 with Na2SO4electrolyte of 3.5% is of the order of hundreds of A/cm2and coated steel given in the order of A/cm2, which leads to think that the projection produces coatings uniform low closed porosity, although techniques DC indicate a significant porosity as is observable current response to the potentiodynamic curve. The observed thicknesses fall into the hundreds of microns and little uniformity was noted in this coatings. The coatings deposited by oxidizing flame was better performance in corrosion than the coating deposited by neutral flame.