Abstract

The development of a sodium hydroxide anodize prebond treatment for titanium alloys, which results in excellent durability of adhesive-bonded joints when assessed by wedge specimens exposed to 50°C and 96% relative humidity, is described. Crack growth data are reported which show that the process resulted in better durability than the 10V chromic acid-fluoride anodize process developed in the USA, and that alkaline hydrogen peroxide etch pretreatments resulted in lower durability than the two anodize processes. Other important advantages of the sodium hydroxide anodize process, including easy process control, are indicated.

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