Influence of coating morphology on adhesive bonding of titanium pre-treated by plasma electrolytic oxidation
Influence of coating morphology on adhesive bonding of titanium pre-treated by plasma electrolytic oxidation
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DOI：
10.1016/j.surfcoat.2016.01.042
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发表时间：
2016-03
影响因子：
5.4
通讯作者：
S. Aliasghari;A. Němcová;P. Skeldon;G. Thompson
中科院分区：
文献类型：
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作者：
S. Aliasghari;A. Němcová;P. Skeldon;G. Thompson
采用搭接剪切试验研究了等离子体电解氧化（PEO）预处理对纯钛粘接性能的影响。比较了铝酸盐-磷酸盐和硅酸盐-磷酸盐电解液的两种预处理方法，得到了不同组成和形貌的镀层。样本用环氧树脂粘合剂连接。PEO处理过的试样主要表现为富钛内涂层区域内的内聚失效，这与未处理钛的粘合失效形成对比。硅酸盐-磷酸盐预处理导致粘合剂渗透涂层的高度多孔外部区域。涂层的断裂发生在钛/涂层界面附近，并覆盖相对较大孔隙的底部，在铝酸盐-磷酸盐涂层的情况下，这些孔隙位于涂层表面处明显的结节下方。与未处理的钛相比，预处理没有显著增加搭接剪切强度。
The effect of plasma electrolytic oxidation (PEO) pre-treatments on the adhesive bonding of titanium is investigated using lap-shear tests. Two pre-treatments are compared, using aluminate-phosphate and silicate-phosphate electrolytes respectively, which result in different compositions and morphologies of coatings. Specimens were joined with an epoxy adhesive. The PEO-treated specimens revealed mainly cohesive failure within the titanium-rich inner coating regions, which contrasted with the adhesive failure of untreated titanium. The silicate-phosphate pre-treatment resulted in the infiltration of a highly porous outer region of the coating by the adhesive. The fracture of the coatings occurred close to the titanium/coating interface and intersected the bases of relatively large pores, which in the case of the aluminate-phosphate coating lay beneath nodules that were evident at the coating surface. The pre-treatments did not significantly increase the lap-shear strength in comparison with untreated titanium.