Comparison on long-term corrosion performance of WC-CoCr and Al2O3-TiO2 ceramic coatings in sulphide-containing 3.5 wt% NaCl solution

Effect of 3.5 % NaCl solution with different Na2S concentrations on ultrasonic cavitation erosion behaviors of HVOF sprayed WC-Ni coatings

“…In comparison to sulphide anions (e.g., S 2– , HS – ), the smaller ionic radius of chloride anions (Cl – ) causes that the structure of corrosion products with chloride is unstable and insufficient to suffer impact of UCE. Furthermore, the sulphide anions with higher polarizability are more easily to be adsorbed on the WC-10Ni coating surface than the chloride anions [58] . The difference between the element content of chloride and sulphide in corrosion product films ( Fig.…”

Corrosion Behavior of Al2O3-40TiO2 Coating Deposited on 20MnNiMo Steel via Atmospheric Plasma Spraying in Hydrogen Sulfide Seawater Stress Environments

“…Chloride ions have a small radius and strong penetration and, in artificial seawater environments, they are able to destroy the oxide film of corrosion products at the interface of the substrate and coating and weaken the protective effect of these products [33,34]. Unlike corrosion products in artificial seawater, corrosion products in a simulated environment might be more chemically stable, leading to a longer blocking effect [14,15]. As a result, the re-increase in corrosion rate due to the dissolution of corrosion products is avoided.…”