Fatigue strength of partially thermal sprayed materials under corrosive environment

Thermal spraying is one of the coating methods to improve the wear, heat and corrosion resistant properties of the metals and alloys [1,2]. The thermal spray coating technique is used to many kinds of thermal spray materials, and it becomes one of the objects of the surface treatment. In order to investigate the fatigue strength of the partially thermal sprayed specimens, the rotating bending fatigue test has been conducted under accelerated corrosive environment cycled among the salt water spray, the dry in the warm air and the exposure in the open air at room temperature. Experimental studies on fatigue strength were performed under corrosive environment by using partially thermal sprayed Zn and Al powder spray materials to medium carbon steels (S45C). Some fundamental data on the mechanical and metallurgical properties of the fatigue strength under corrosive environment were obtained by using partially thermal sprayed specimens. The data is discussed with a view to optimizing the methods, and also it is compared with those of the non-sprayed and painted specimens in terms of fatigue limit and Vickers hardness tests. and the macro and micro structural observations were also made with microscopes and SEM.