硬膜缓蚀剂对钛合金紧固件电偶腐蚀的防护作用研究  

Protective Effect of Hard Film Corrosion Inhibitor on Galvanic Coupling Corrosion of Titanium Alloy Fasteners

作　　者：刘恕骞 文茂 王善岭[1] 许斌[2] 罗丹[2] 王茂川 钟勇[2] LIU Shuqian;WEN Mao;WANG Shanling;XU Bin;LUO Dan;WANG Maochuan;ZHONG Yong(Chengdu Aircraft Industrial(Group)Co.,Ltd.,Chengdu 610500,China;Southwest Institute of Technology and Engineering,Chongqing 400039,China)

机构地区：[1]成都飞机设计研究所,成都610500 [2]西南技术工程研究所,重庆400039

出　　处：《装备环境工程》2024年第3期32-38,共7页Equipment Environmental Engineering

摘　　要：目的 研究YTF-3硬膜缓蚀剂对由TC4螺栓、不锈钢螺母、7050铝合金及TC4钛合金夹层板组成的组件电偶腐蚀的影响作用。方法 利用硬膜缓蚀剂对钛合金紧固件和夹层板进行整体腐蚀防护处理,并通过盐雾加速腐蚀试验。将齿轮槽螺栓与无耳托板自锁螺母安装连接后,进行自然环境加速腐蚀试验,腐蚀后对螺栓螺母以及夹层板的腐蚀情况进行拍照检查,采用图像处理方式对腐蚀情况进行评价,并通过室温拉伸试验对钛合金螺栓腐蚀前后的力学性能情况进行对比分析。结果 经过腐蚀试验后,TC4螺栓和铝合金组件刷涂缓蚀剂区域比未刷涂缓蚀剂区域的平均腐蚀面积要小。不锈钢螺母与TC4钛合金组件刷涂缓蚀剂区域出现明显褶皱和破损现象。对比了试验前后钛合金螺栓的最大拉断载荷,发现降幅仅为0.5%。结论 铝合金夹层板会遭受电偶腐蚀,而YTF-3缓蚀剂可以有效隔绝腐蚀介质渗入固定间隙,大幅缓解电偶腐蚀,而钛合金螺栓在加速腐蚀试验中并未发生明显的腐蚀,并且力学性能无明显改变。The work aims to study the effect of YTF-3 hard-film corrosion inhibitor on the galvanic coupling corrosion of the assembly consisting of TC4 bolts,stainless steel nuts,7050 aluminum alloy and TC4 titanium alloy sandwich plate.The hard film corrosion inhibitor was utilized for the overall corrosion protection treatment of titanium alloy fasteners and sandwich plates,the salt spray accelerated corrosion test was carried out to the fasteners and sandwich plates.In the test,the gear groove bolts and the self-locking nuts without lug pallets were installed and connected to carry out the natural environment accelerated corrosion test,and the corrosion of the bolts and nuts as well as the sandwich plate was photographed and examined and evaluated by the image processing method.The mechanical properties of the titanium alloy bolts before and after the corrosion were comparatively analyzed by the room temperature tensile test.After the corrosion test,the average corrosion area of TC4 bolts and aluminum alloy assemblies with brushed corrosion inhibitor area was smaller than that of the unbrushed corrosion inhibitor area.Stainless steel nuts and TC4 titanium alloy assemblies with brush-coated corrosion inhibitor areas showed obvious wrinkles and breakage.The maximum pull-off load of titanium alloy bolts before and after the test was compared and found to have decreased by only 0.5%.Aluminum alloy sandwich plate will suffer galvanic coupling corrosion,and YTF-3 corrosion inhibitor can effectively isolate the corrosive medium penetration into the fixed gap,significantly alleviating the galvanic coupling corrosion,while titanium alloy bolts in the accelerated corrosion test do not have obvious corrosion,and the mechanical properties of the mechanical properties are not significantly changed.

关 键 词：钛合金 铝合金 紧固件 电偶腐蚀 缓蚀剂 腐蚀防护 

分 类 号：TG172[金属学及工艺—金属表面处理]