The tensile and fatigue tests of the free-standing cold sprayed SUS316 coating (CS316 coating) were carried out in this study.The effects of the post spray heat treatment (PSHT) on the mechanical properties were investigated. The ductility, elastic modulus, and tensile strength was strongly improved by the PSHT, in addition, 0.2% proof stress and the fatigue strength of CS316 coating were almost comparable to those of the bulk SUS316 steel. The as-sprayed CS316 coating exhibited anisotropic mechanical properties, however, they became isotropy after the PSHT. The cross sectional SEM observations of CS316 coating were carried out. It was revealed that there are a lot of pores and narrow inter-splat pores in CS316 coating before the PSHT, on the other hand, the narrow inter-splat pores diminished during the PSHT. It can be considered from these results that the mechanical properties of CS316 coating are correlated with the pore structure.
Sprayed Al-5Mg coating is widely used as a protection against corrosion on infrastructures composed of steels, such as bridges and elevated roads near seacoast. Previously, the first-principles calculation had indicated that additional metals of Sn, Li, Zn, Ca, Y and Bi have a possibility to improve cathodic protection ability for sprayed Al-5Mg coatings. In this paper, those additional metals effects on tensile adhesive strength of sprayed Al-5Mg coatings were examined. Consequently, the tensile adhesive strength of the sprayed Al-5Mg coating was 8 MPa, and those of 0.35 mass% Sn, 2.95 mass% Zn, 0.16 mass% Ca, 0.04 mass% Y and 0.19 mass% Bi added coatings were over 8 MPa. By contrast, 0.23 mass% Li added coating was 7 MPa, reduced in strength,because the hardness of its coating became lower. It was recognized that additional metals of Sn, Zn, Ca, Y and Bi were not reduce the tensile adhesive strength of sprayed Al-5Mg coating.