Effect of Multi-element Alloy Surface Thermal Spraying on Corrosion Resistance of Steel Structure
Elemental zinc(Zn) and multi-element alloy Zn-Co-RE were sprayed on the surface of steel structure Q345B by high-velocity oxygen fuel(HVOF) spraying.And the corrosion behaviors of steel structure were comparatively tested by immersion corrosion experiment,electrochemical corrosion experiment and neutral salt-spray corrosion experiment.The results show that compared with the steel structure Q345B without spraying,multi-element alloy Zn-Co-RE surface HVOF spraying can make the mass loss rate of steel structure in the acid rain atmosphere for 360 h decrease 85.57%,help corrosion potential increase 39.37% to positive direction in 5%NaCl room temperature electrolyte,make the mass loss rate of steel structure in the neutral salt-spray corrosion environment for 240 h decrease 87.94%,and can effectively improve the corrosion resistance of the steel structure.