Avaliação do revestimento WC-10Co4Cr HVAF por meio de ensaios de corrosão a quente e soldering para fundição de alta pressão de alumínio

Abstract

The present work aims to study the WC-10Co4Cr coating applied by the HVAF method on Tenax300, applied in molds for the HPDC foundry process. The wear and tear of these HPDC molds cause a high cost for the industry, which can lead to frequent maintenance and an added cost. These processes can occur by die soldering, corrosion, erosion and thermal fatigue. Thus, focusing on solving these problems can improve the viability of this foundry process in the market. A good solution for the defects found is the use of thermal spray to coat the surface of the mold, which provides good surface resistance and an excellent finish. In this way, we sought to study the WC-10Co4Cr coating, which is widely used in the market and has many applications. The evaluations were made with Corrosion and Soldering tests against the coating, followed by a metallographic preparation of the samples and after that analyzes by means of scanning microscopy (SEM) and X-ray energy dispersion spectrometry (EDE) were carried out. performed. The results of the tests were satisfactory, demonstrating the good performance of the coating in protecting the material and, through the comparison with the result of the coating of Cr3C2 25NiCr and AISI H13 without protection, it is possible to see the efficiency of the material in comparison with other coatings and the need to apply coatings to the molds used in the HPDC.