Investigation of the Impact of Thermal Spraying with Diverse Ceramic  Powders on the Sliding Corrosion Resistance of (AISI 446) Steel Alloys

Authors

According to this study, the sliding wear resistance of (AISI446) stainless steel alloy

thermally coated with various ceramic powders such as silicon oxide and carbide

and at different weight concentrations was studied, obtaining these

coatings with a (QH-2/H thermal spray) welding torch. In order to assess these coatings'

performance, The test for sliding wear resistance was carried out. using a pin-on-dish

sliding wear tester designed according to (ASTM D5963) specifications under variable

vertical loads, speeds or surfaces. The testing results indicated the efficiency of these

coatings in enhancing the erosion resistance to sliding wear of the various covered alloys

in contrast to the base alloy that isn't coated. All of the samples that were evaluated

showed a gradual rise in wear rate as the loads increased. It was also discovered that the

alloy (F2)which contained silicon carbide at a rate of (100%) and the binder material

(Ni-Al), displayed the lowest corrosion rate compared to the coated and uncoated alloys.

Additionally, compared to the basic alloy, this alloy's corrosion rate dropped by 54.70%

under the load (26N), however the coated sample (F4) consisting of silicon carbide and a

percentage of (80 wt. %SiC+20 wt. % SiO2) The highest wear rate of the uncoated alloy

base with an improvement rate of -)53.96%(. The alloy (F4), including 80% silicon

carbide (SiC) and (20%) silicon oxide (SiO2), had the lowest sliding wear rate at a speed

of (180 rev/min), demonstrating an improvement rate of (74.14%). Although the

abrasive surface exhibited significant enhancements in sliding wear resistance the coated

sample (F4) exhibited higher wear rates than the uncoated base alloy at varying

percentages in comparison to the uncoated base alloy, with a rate of (-109.49%).