Environmental durability of phosphoric acid anodized aluminium adhesive joints protected with hydration inhibitors

An adsorbed monolayer of the organic inhibitor nitrilotris methylene phosphonic acid (NTMP) improves the bond durability of 2024 Al adherends prepared by phosphoric acid anodization (PAA). As had previously been determined for Forest Products Laboratories (FPL)-prepared adherends, max. improvements...

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Bibliographic Details
Published in:Journal of materials science 1986, Vol.21 (1), p.179-187
Main Authors: HARDWICK, D. A, AHEARN, J. S, DESAI, A, VENABLES, J. D
Format: Article
Language:English
Subjects:
acids
adhesives
aluminum
Applied sciences
bonding
Exact sciences and technology
materials testing
Other techniques and industries
surface properties
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Summary:An adsorbed monolayer of the organic inhibitor nitrilotris methylene phosphonic acid (NTMP) improves the bond durability of 2024 Al adherends prepared by phosphoric acid anodization (PAA). As had previously been determined for Forest Products Laboratories (FPL)-prepared adherends, max. improvements occurred when a monolayer of NTMP was adsorbed onto the surface. Examination of the wedge test failure surfaces of PAA adherends treated in NTMP revealed that although crack propagation had initially involved oxide to hydroxide conversion of the original PAA oxide, the locus of failure transfers to the adhesive near the surface quite early in the test. This means that the failure of NTMP-treated PAA adherends was predominantly cohesive through the adhesive. 10 ref.--AA(UK/US).
ISSN:0022-2461
1573-4803
DOI:10.1007/BF01144718