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 evalu-ated 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 wrin-kles 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 corro-sion,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.
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