The damage caused by the combination of corrosion andwear processes on thematerials that machine elements are produced causes huge losses in several industries such as mineral processing, chemical, petrochemical and power generation. Some devices that operate in harsh environments, such as centrifugal pumps for transportation of caustic liquor used in the industries of production of aluminum, undergo a rapid deterioration of their materials by the coexistence of corrosion and erosion at temperatures around 75 °C. The aimof thiswork is to study newways for the corrosive–erosive problems confronted by the aluminum and nickel industries. Several coating materials in powder orwire formapplied by GMAwelding and HVOF thermal spray techniques are compared in erosion and erosion–corrosion tests. Corrosion testswere performed for comparison. A solution of 1MNaOHwas used as a corrosive mediumto get the polarization curves The temperature of the electrolyte was 25 °C. For pure erosion test, the slurry erosive agent was 4 l of water and an erosive particle concentration of 400 g/l. Particles of ferric oxide, HRC= 40–50 and an average diameter of 600 μm, were used as an erosive agent. The impact angle of 90° was tested, with an impact velocity of the abrasive particles of 31m/s. Tests were performed for each condition at a time of 2 h at intervals of 20 min. The results show that the best performance was that of the mixed stainless steel and cobalt alloyswelded coating even though the general resistance to erosive–corrosivewear significantly favors cermets in relation to the other welded deposits.