Effect of the angle of incidence on HfN monolayers exposed to corrosion erosion phenomena.
Abstract
Hard coatings are an alternative for surface improvement of industrial tools since they are developed with the purpose of increasing the lifespan of materials through the enhancement of its characteristics against wear mechanisms and corrosion phenomena. In this study, hafnium nitride monolayers were deposited on AISI 4140 steel substrates through the RF magnetron technique (13.56 MHz) to determine estimated values of material loss, mechanical wear and synergy in the corrosion and erosion phenomena, according to the ASTM G119–03 standard, which relates corrosion to wear. The monolayers were evaluated against corrosion-erosion phenomena, as well as corrosion and erosion at two incidence angles of 30° and 90° in a solution composed by 0.5 M NaCl, using impingement jet equipment to analyze the effect of the incidence angle on the corrosion erosion resistance of these coatings. Through Tafel polarization curves and scanning electron microscopy, the electrochemical evaluation and the micro-structural characterization of the coatings were respectively made. An increase in the corrosion rate on the systems subjected to 90° and a decrease on those subjected to 30° was observed.
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