Abstract
To improve the corrosion resistance of Q235 carbon steel in 3.5 wt.% NaCl solution, an Fe-based amorphous coating was deposited on the surface of Q235 carbon steel by detonation gun (D-gun) spraying method. It was found that the coating showed a typical amorphous phase with hardness of about 850 Hv. The morphology of the microdomains showed that the coating was dense, contained no visible defects, and its porosity was about 0.7%. The micro-regional element analysis indicates the formation of Cr7C3 during the spraying process. Compared with Q235 carbon steel, electrochemical tests show that the coating has higher pitting corrosion potential (− 296 versus − 914 mV for Q235 carbon steel), and lower corrosion current density (1.7 versus 24.6 μA/cm2 for Q235 carbon steel), and larger polarisation resistance (11,306.8 versus 1,821.1 Ω cm2 for Q235 carbon steel), indicating that the coating is more resistant to corrosion. XPS analysis shows that the coating forms a passivation film, rich in Cr and Mo, in the 3.5 wt.% NaCl solution. It exhibits excellent corrosion resistance, and limits the severity of corrosion, of carbon steel.
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