Preparation of Al2O3 Gradient Coating on 316L Stainless Steel Substrate

JIANG Li; LUO Xin-yi; TAO Jie; CHANG Hua; GAO Qiang

Materials and Mechanical Engineering > 2008 > 32(12): 40-43.

JIANG Li, LUO Xin-yi, TAO Jie, CHANG Hua, GAO Qiang. Preparation of Al2O3 Gradient Coating on 316L Stainless Steel Substrate[J]. Materials and Mechanical Engineering, 2008, 32(12): 40-43.

Citation:

JIANG Li, LUO Xin-yi, TAO Jie, CHANG Hua, GAO Qiang. Preparation of Al2O3 Gradient Coating on 316L Stainless Steel Substrate[J]. Materials and Mechanical Engineering, 2008, 32(12): 40-43.

Citation:

JIANG Li, LUO Xin-yi, TAO Jie, CHANG Hua, GAO Qiang. Preparation of Al2O3 Gradient Coating on 316L Stainless Steel Substrate[J]. Materials and Mechanical Engineering, 2008, 32(12): 40-43.

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Preparation of Al2O3 Gradient Coating on 316L Stainless Steel Substrate

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Received Date: March 25, 2008

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Fe-Al gradient coating was prepared on 316L stainless steel surface by hot-dip aluminizing and high-temperature thermal diffusion.Then the as-prepared aluminized coating was oxygenated by the residual O2 in 98.5%N2.The coating was analyzed by OM,SEM,EDS,XRD,XPS and microhardness.The results show that the average thickness of the coating is 120 μm with good surface after hot dipping at 750 ℃ for 10 min and diffusion at 950 ℃ for 4 h.The coating also had good adherence with the substrate.The surface hardness was up 800-850 HV.Elements of Fe and Al were in gradient distribution.After oxygenating at 900 ℃ for 4 h,oxygen was preferentially combined with aluminium.Alumina was generated by in-situ reaction with a gradient distribution in the oxide film except of the surface.
- 316L stainless steel,
- hot-dip aluminizing,
- thermal diffusion,
- oxidation treatment

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