Study of the Effect of Using Various Ceramic Powders in Thermal Spraying Technology on the Sliding Corrosion Resistance of Steel Alloys (AISI446)..

Different phenomena require separate measurement of corrosion rate and sliding wear rate. The chemical decomposition between materials contacting their environments results in corrosion but the friction generated by moving surfaces causes sliding wear. Scientists studied the sliding wear resistance of AISI 446 stainless steel alloy which received thermal coatings made from diverse concentrations of silicon oxide, silicon carbide and nickelaluminum (SiC + SiO2 + Ni-Al) ceramic powders. Thermal spray welding torch (QH-2/H) served as the equipment to apply the coatings. The testing procedure followed ASTM D5963 standard specifications for a pin-on-dish apparatus which operated at different vertical loads with speeds and dish surface parameters. The experimental analysis revealed that the utilized coatings demonstrated superior sliding wear resistance than the original base alloy after the inclusion. The wear rate of all tested samples rose steadily while the loads increased. The alloy N_1 achieved the lowest corrosion rate while containing 75% silicon carbide combined with 25% Ni-Al binder material. The alloy manifested a -60.36% decline of corrosion rate against the base alloy when subjected to 26N of vertical force. The alloy (N_6) composed of 75% SiC and no SiO2 generated the minimal sliding wear rate of 180 rev/min because of its 45.42% enhanced performance. Sample (N_1) demonstrated decreased performance compared to the uncoated alloy even though its abrasive surface generated better wear resistance. The result showed an increase of -13.24% in wear rates .