钛合金表面微细结构在海水中耐蚀性实验设计

Experiment Design for Corrosion Resistance of Titanium Alloy Surface Microstructure in Seawater

为研究钛合金表面微细结构在海水中的耐蚀性,利用激光在钛合金表面上加工出微细结构,并用氟硅烷修饰获得超疏水的钛合金表面,将所制样品放进40℃的人工海水中浸泡1 d,对比人工海水浸泡前后钛合金表面微细结构的形貌、元素含量和极化曲线变化。结果表明:其形貌没有明显变化,氧含量只增加了1.1%,开路电势和自腐蚀电势在人工海水浸泡前后没有发生变化,分别为0.08和-0.07 V,说明超疏水的钛合金表面微细结构在人工海水中具有很好的耐蚀性。同时构造了新的塔菲尔(Tafel)函数,动态评价钛合金表面微细结构在人工海水中的耐蚀性,为钛合金表面微细结构在海水中的耐蚀性评价提供有效的指引。

In order to study the corrosion resistance of titanium alloy surface microstructure in seawater,laser was used to process the microstructure on the titanium alloy surface,and a superhydrophobic titanium alloy surface was obtained by modifying it with fluorosilane.The prepared sample was immersed in artificial seawater at 40℃for one day,and the morphology,element content,and polarization curve changes of the titanium alloy surface microstructure before and after artificial seawater immersion were compared.The results showed that there was no significant change in its morphology,and the oxygen content only increased by 1.1%.However,the open circuit potential and self-corrosion potential did not change before and after immersion in artificial seawater,with values of 0.08 V and-0.07 V,respectively.This indicates that the surface microstructure of superhydrophobic titanium alloy has good corrosion resistance in artificial seawater.At the same time,a new Tafel function was constructed to dynamically evaluate the corrosion resistance of titanium alloy surface microstructure in artificial seawater,providing effective guidance for the corrosion resistance evaluation of titanium alloy surface microstructure in seawater.