Mechanical Properties of Adhesively Bonded Aluminum Structures Protected with Hydration Inhibitors,

reportActive / Technical Report | Accession Number: ADA123403 | Open PDF

Abstract:

Research has shown that 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, maximum improvements in bond durability 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-hydroxide conversion of the original PAA oxide, the locus of failure transfers to the adhesive near the interface quite early in the test. This means that the failure of NTMP-treated PAA adherends was predominantly cohesive through the adhesive. In addition, the presence of NTMP at the oxideadhesive interface did not degrade the initial bond strength when epoxy-based adhesive systems were used. Author

Author(s):
Hardwick, D. A. ; Ahearn, J. S. ; Venables, J. D.
Author Organization(s):
MARTIN MARIETTA LABS BALTIMORE MD
Descriptive Note:
Second year rept.,
Pagination:
0041

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
MML-TR-23C
Contract/Grant Number(s):
N00014-80-C-0718
 Subject Terms
Joint Capability Areas:
JCA_5_Command and Control; JCA_5.3_Planning; JCA_1.2.5_Lessons Learned; JCA_3.2_Engagement; JCA_3_Force Application
Communities of Interest:
Advanced Electronics
Descriptor(s):
*MECHANICAL PROPERTIES, *BONDED JOINTS, *ADHESIVE BONDING, INTERFACES, LAYERS, STRUCTURES, FAILURE, STRENGTH(MECHANICS), CRACK PROPAGATION, OXIDES, ALUMINUM, ORGANIC COMPOUNDS, INHIBITORS, ANODIC COATINGS, PHOSPHONIC ACIDS, HYDRATION
Field(s)/Group(s):
Adhesives, Seals and Binders, Metallurgy and Metallography, Mechanics
Report Date:
1982 Nov 01