Erosion–corrosion of HVOF-sprayed Fe-based amorphous metallic coating under impingement by a sand-containing NaCl solution

• Published in: Corrosion science Vol. 76; pp. 337 - 347
• Main Authors: Zheng, Z.B., Zheng, Y.G., Sun, W.H., Wang, J.Q.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.11.2013; Elsevier
• Subjects: A. Metal coatings; A. Stainless steel; Applied sciences; Austenitic stainless steels; B. Erosion; B. Polarisation; B. Potentiostatic; C. Passivity; Coating; Corrosion; Corrosion environments; Critical flow; Erosion-corrosion; Exact sciences and technology; Impact angle; Impact velocity; Impingement; Metallic coatings; Metals. Metallurgy; Production techniques; Steels; Surface treatment; C. Passivity; A. Metal coatings; B. Erosion; B. Potentiostatic; B. Polarisation; A. Stainless steel; HVOF spraying; Hot spraying; Sodium chloride; Spray coating; Passivity; Surface treatment; Metal coating; Stainless steel; Erosion corrosion; Erosion; Passivation
• ISSN: 0010-938X; 1879-0496
• DOI: 10.1016/j.corsci.2013.07.006

•The coating shows higher resistance to slurry impingement than 304 stainless steel.•The mass loss of the coating reaches the peak at an impact angle of 90°.•Two impingement mechanisms of the coating were found out at various impact angles.•Critical flow velocities were studied using potentiostatic tests under impingement.•Passive films formed at different impact velocities are of different thicknesses. Erosion–corrosion (E–C) behaviour of a Fe-based amorphous metallic coating (AMC) compared with 304 stainless steel (304 s.s.) was studied under a slurry impingement condition in a sand-containing NaCl solution. AMC exhibited much higher resistance to E–C than 304 s.s. The weight loss reached the maximum at an impact angle of 90° and the critical flow velocity was about 15m/s for AMC, while 45° and 9m/s for 304 s.s. The increment in passive current density under impingement for AMC was about 10 times lower than 304 s.s. Passive films formed at different impact velocities were of different thicknesses.