Abstract
CuAl2 intermetallic powders were consolidated using an atmospheric plasma spraying process. Based on X-ray diffractometry results, no phase change occurred during thermal spraying. The investigation of optical micrographs showed that about 7% porosity was present in the microstructure of the coatings. The coatings showed hardness value up to 575 HV(50 g). The polarisation tests and electrochemical spectroscopy measurements were utilised for electrochemical investigation of the coatings in 1 M H2SO4 and 3.5% NaCl media. In H2SO4 environment, the coated and uncoated samples showed similar corrosion rates. However, the coating showed a lower corrosion rate than the substrate in NaCl solution by an order of magnitude. Corrosion of the steel substrate occurred in the NaCl solution, no corrosion was observed in the H2SO4.
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