By John Comyn
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F) Preferably apply primer coat immediately. Etching procedures have been recommended for other metals used in engineering. ANODIZING OF METALS Anodizing aluminium and its alloys gives the most water-durable adhesive joints, and is used by aircraft makers. Anodizing in chromic acid is favoured by European makers, and in phosphoric acid in the USA, but there are also differences in the alloys used. An advantage in using phosphoric acid is lower toxicity and easier disposal. Below is a phosphoric acid anodize procedure used in the USA: (a) Vapour degrease for 10min.
1, where n is ca. 2. The pure compound is a solid but the commercial product is, more conveniently, a liquid. 2. 2) Tetraglycidyl diarninodiphenylmethane Both aromatic and aliphatic amines are used as hardeners, and the stoichiometry is that one epoxide ring will react with one aminehydrogen atom in a condensation polymerization. 2. 2 Reaction of primary amine with 2 epoxide groups. 4). 3. Such compounds are often known as Versamids. 3 temperature or the process can be accelerated b heating. Typical c re times are 14 h at room temperature or 3 h at 80 "C.
It is essential that these are removed from the composite before any bonding and solvents or abrasives may be used. An elegant alternative is the use of peel plies, which is a layer of material built into the face of a composite, which can be stripped away before bonding. NON-STICK (ABHESION) With a few exceptions all materials can be bonded with adhesives. The exceptions are the polyolefins (polyethylene and polypropylene), silicones and some fluoropolymers. 1. 1 Surface energies of non-stick materials.
Adhesion Science by John Comyn