LAUSR

This paper explored the evolutions of microstructure, fracture toughness and sliding wear behaviors in 3.5 wt.% NaCl solution of Fe43Cr16Mo16(C, B, P)25 amorphous coatings prepared by air plasma spraying process with various powers. The results showed that the as-sprayed coatings display full glassy nature and high thermal stability with glass transition temperature (Tg) and onset crystallization temperature (Tx) of 595 and 672 °C, respectively. The coatings become denser as a function of spraying powers. At a lower power of 28 kW, the average hardness and fracture toughness of the coating are 13.1 GPa and 2.62 MPa m1/2, respectively. At a higher power of 42 kW, they are gradually increasing to 22.1 GPa and 4.25 MPa m1/2, respectively. The spraying power also has a remarkable influence on sliding wear behaviors of the coating under corrosive environment. The wear rate in a 3.5 wt.% NaCl solution of the coating deposited with 42 kW is about 1.6 and 4.2 times lower than that of the coating deposited with 28 kW and EQ 70 marine steel, respectively. The microdefects and corrosion phenomena responsible for the variations of the wear rate of the coatings under corrosive environment are discussed in details.