硅烷涂层对316L不锈钢耐腐蚀性能的影响

Effect of Silane Coating on Corrosion Resistance of 316L Stainless Steel

目的提高316L不锈钢的耐腐蚀性能。方法在316L不锈钢样品表面涂覆主要成分为1,2-二(三乙氧基硅基)乙烷(BTSE)的硅烷涂层。通过电化学分析测试,评价涂覆硅烷涂层的316L不锈钢的耐蚀性,并通过扫描电子显微镜和扫描电化学显微镜对其表面形貌进行分析。结果在相同的腐蚀环境下,与未涂覆硅烷涂层的316L不锈钢样品相比,涂覆硅烷涂层样品的表面更加光滑,点蚀现象明显好转。电化学测试结果显示,涂覆硅烷涂层的316L不锈钢样品的腐蚀电位为?565.02m V,未涂覆硅烷涂层样品的腐蚀电位为?796.01 mV,前者明显高于后者,其腐蚀倾向明显减小。另外,涂覆硅烷涂层的316L不锈钢样品的腐蚀电流为2.5177μA,未涂覆硅烷涂层样品的腐蚀电流为5.4291μA,涂覆硅烷涂层样品的腐蚀电流明显更小,表现出了更好的耐腐蚀性能。通过观察扫描电化学显微镜图像可以得出,未涂覆硅烷涂层的316L不锈钢样品的电流范围为?3.144×10?9～?1.957×10?9 A,涂覆硅烷涂层的316L不锈钢样品的电流范围为?3.004×10?9～?1.975×10?9A,涂覆硅烷涂层样品的电流范围更窄,腐蚀程度明显减轻。结论在316L不锈钢表面涂覆硅烷涂层可以在一定程度上减缓样品的腐蚀程度,硅烷涂层起到了物理屏障的作用,显着提高了316L不锈钢的耐腐蚀性。

The work aims to improve the corrosion resistance of 316L stainless steel.The silane coating with 1,2-bis(triethoxysilyl)ethane(BTSE)as main component was coated on the surface of the 316L stainless steel sample.The corrosion resistance of coating on 316 stainless steel was evaluated by electrochemical analysis.The surface morphology was analyzed by scanning electron microscopy and scanning electrochemical microscopy.The silane-coated sample surface was smoother and pitting corrosion was significantly improved when compared to the silane-coated 316L stainless steel sample in the same corrosive environment.From the electrochemical test results,the corrosion potential of the silane-coated 316L stainless steel sample was?565.02 mV and the corrosion potential of the uncoated-silane sample was-796.01 mV.The corrosion potential of silane-coated 316L stainless steel sample was significantly higher than that of uncoated-silane sample,and the corrosion tendency was significantly reduced.In addition,the silane-coated 316L stainless steel sample had a corrosion current of 2.5177μA and the uncoated sample had a corrosion current of 5.4291μA.The silane-coated sample exhibited lower corrosion current and showed better corrosion resistance.From the scanning electrochemical microscopy image,the uncoated 316L stainless steel sample had a current range of-3.144×10^-9^-1.957×10^-9 A,and the silane-coated 316L stainless steel sample had a current range of-3.004×10^-9^-1.975×10^-9 A.The silane-coated sample had a narrower current range and less corrosion.Therefore,silane coating on the surface of 316L stainless steel can slow the corrosion of the sample to a certain extent.The silane coating acts as a physical barrier and significantly improves the corrosion resistance of 316L stainless steel.