Análise da variação de espessura e porosidade superficial da camada de revestimento de alumínio em substrato de aço por aspersão via arco elétrico com controle automatizado e manual

Abstract

The application of coating by thermal spraying aims at depositing material on substrate to obtain better mechanical properties like wear, corrosion, etc. In this work two methods were used, being manual application and automated application via robot, for the application of electric arc thermal spray having na electric arc with source of combustion of the material in wire format, melting it by a potential difference and accelerated by the air compressed gas being the transport gas, reaching high temperatures, high oxidations due to contact with compressed air, and may contain pores. The purpose of the research is to analyze and compare the two methods used, manual application and through robotic control of parameters, attesting its micrograph and microhardness. The coating material used was aluminum wire sprinkled on SAE 1020 steel substrates. Layer thickness size, porosity, visualization of the steel-aluminum intersection region showed that the control of the parameters allows for a more homogeneous coating and a decrease in the amount of pores and influence on layer thickness size. In general, the results indicate to the technique of applying the manual operator, the gun-substrate distance, the controls of the robot, the way of preparation of the surface of the substrate directly affects the spray coating The increase in the thickness of the coated layer increases the microhardness slightly.