| After performing boronizing treatment on the flame sprayed stainless steel coatings formed on SM45C substrate, mechanical properties and corrosion resistance were investigated. The mechanical properties were measured by microhardness test, abrasion test and bond strength test. the corrosion resistance was examined by potentiodynamic polarization method in 2M H₂SO₄, 2M HCl, 2M H₃PO₄ and 2M HNO₃ solutions. The thickness of boride layers formed on stainless steel coatings increased with boronizing temperature and time. but fairly this layers formed on stainless steel coatings compared with low alloy steels. The microhardness of boronized stainless steel coatings was about 7 times higher than that of as-sprayed stainless steel coatings because of the formation of boride such as FeB and Fe₂B. The wear resistance was also improved about 5 times by boronizing treatment. The corrosion resistance of boronized stainless steel coatings was superior to that of as-sprayed stainless steel coatings in acid solutions as 2M HCl, 2M H₂SO₄ and 2M H₃PO₄. The bond strength between the substrate and stainless steel coatings was increased about two times by boronizing treatment. |
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