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