Influence of coating morphology on adhesive bonding of titanium pre-treated by plasma electrolytic oxidation

SURFACE & COATINGS TECHNOLOGY

卷:289

Article

Aliasghari, S.¹  Nemcova, A.¹  Skeldon, P.¹  Thompson, G. E.¹ 

[1] Univ Manchester, Sch Mat, Corros & Protect Grp, Oxford Rd, Manchester M13 9PL, Lancs, England

关键词: Titanium;    Plasma electrolytic oxidation;    Adhesive bonding;   

DOI  :  10.1016/j.surfcoat.2016.01.042

来源: Elsevier

【 摘 要 】

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. (C) 2016 The Authors. Published by Elsevier B.V.

【 授权许可】

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