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为了研究表面渗铝的SUS316ss在秸秆锅炉过热器中的应用,用金相显微镜和扫描电镜观察表征了SUS316ss渗铝层的断面形貌,分析了渗铝层显微硬度随深度的变化,用失重法测试了SUS316ss及其渗铝后在6%FeCl3+0.05mol/L HCl溶液中的耐蚀性,1000℃下的抗高温氧化,及表面沉积HCl-H2O-NaCl-KCl-NaOH-Na2SO4-K2SO4多相混合物在500℃下的耐蚀性。结果表明:SUS316ss表面渗铝层结构致密,渗层厚度为35μm;在6%FeCl3+0.05mol/L HCl溶液中,SUS316ss发生了严重孔蚀,渗铝后表面发生轻微孔蚀;渗铝SUS316在1000℃下加热,表面和断面形貌完好,耐高温氧化性提高了5~8倍;在500℃下表面沉积多相混合物,渗铝的SUS316ss耐腐蚀性提高7~8倍。
In order to study the application of surface aluminized SUS316ss in straw boiler superheater, the morphology of SUS316ss aluminized layer was characterized by metallographic microscope and scanning electron microscope. The change of microhardness of aluminized layer with depth was analyzed. Method was used to test the corrosion resistance of SUS316ss and its aluminized in 6% FeCl3 + 0.05 mol / L HCl solution, the high temperature oxidation at 1000 ℃ and the surface deposition of HCl-H2O-NaCl-KCl-NaOH-Na2SO4-K2SO4 Corrosion resistance of multi-phase mixtures at 500 ° C. The results show that the aluminized layer on the surface of SUS316ss is dense and the thickness of the layer is 35μm. In the 6% FeCl3 + 0.05mol / L HCl solution, severe pitting corrosion occurs on the surface of SUS316ss. At 1000 ℃, the surface and cross-sectional morphology are intact, and the high temperature oxidation resistance is increased by 5 to 8 times. When multi-phase mixture is deposited on the surface at 500 ℃, the corrosion resistance of aluminized SUS316ss is improved by 7-8 times.