Environmentally friendly anodising process for structural bonding of titanium: Umweltfreundliches Eloxierverfahren für strukturelles Verkleben von Titan. Issue 5 (20th May 2016)

• Record Type: Journal Article
• Authors: Rico‐Oller, B.; Mertens, T.; Kolb, M.; Wehr, J.; Zheludkevich, M.
• Other Names: Öchsner A. guestEditor.; Altenbach H. guestEditor.
• Is Part Of: Materialwissenschaft und Werkstofftechnik. Volume 47:Issue 5/6(2016:Jun.)
• Page Start: 400
• Page End: 408
• Publication Date: 2016-05-20
• Subjects: Titanlegierung -- Haftung -- Vorbehandlung von Oberflächen -- Beständigkeit -- Oberflächenmorphologie; Titanium alloy -- adhesion -- surface pre‐treatment -- durability -- surface morphology; Materials -- Periodicals; Materials -- Testing -- Periodicals; 620.1
• DOI: 10.1002/mawe.201600515
• Languages: English
• ISSNs: 0933-5137

Abstract

Abstract : This paper evaluates the applicability of two wet‐chemical treatments for structural bonding of titanium alloy Ti6Al4V. The anodising processes, NaTESi and N4‐Process, are based on electrolytes containing sodium hydroxide and complexing agents, but while NaTESi process contains ethylenediaminetetraacetic acid, a particularly hazardous chemical, N4‐Process is a REACh compliant electrolyte. Scanning electron microscopy and transmission electron microscopy were employed to evaluate the oxide layer formed after the anodising processes. The long‐term durability and the resultant adhesion properties on titanium were assessed by means of floating‐roller‐peel test. Both investigated anodising processes lead to oxide layers revealing a highly porous nanostructure (thickness between 150–600 nm) according to scanning electron microscopy and transmission electron microscopy analyses. The mechanical tests lead to negligible differences between processes, performing higher peel resistance when compared to only alkaline etched samples, especially after 1000 hours ageing at 50 °C and 95 % relative humidity. The results indicate that N4‐Process is a promising treatment to enhance the long‐term durability of bonded titanium joints, especially under hot and wet conditions.