Synergistic effects between erosion and corrosion of two coatings and two steels in two-phase flow

The Synergistic effects between erosion and corrosion of two high velocity oxy-fuel (HVOF) Ni-based coatings (Ni60JH and Delelo50) deposited on a low carbon steel in a liquid-solid two-phase flow were systematically investigated by a weight loss test method and an electrochemical method. And a stainless steel was compared to the two coatings and the substrate. The experiment results indicate: (1) At the erosion rate 5-10 m/s, the erosion-corrosion resistance of Ni60JH and Delelo50 coatings was 8-15 times and 3-5 times higher than that of the substrate, respectively. And the erosion-corrosion resistance of Ni60JH coatings slightly exceeded that of the stainless steel. (2) The weight loss rates of the synergistic effects between erosion and corrosion of the four types of material changed from 45% to 80% of the total weight loss rates with the erosion rate increasing from 5 m/s to 10 m/s. The weight loss rates of the synergistic effects between erosion and corrosion were primary in the total weight loss rates of erosion and corrosion. (3) In the pure corrosion, the main corrosion characteristic of Ni60JH coating and stainless steel was the uniform corrosion, while that of Delelo50 coating and low carbon steel was the selective corrosion.