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Accession Number:
AD0904941
Title:
Materials and Approaches for Improved Stress Corrosion Inhibitive Coatings.
Corporate Author:
TYCO LABS INC WALTHAM MA
Report Date:
1972-11-01
Abstract:
The purpose of this program was to develop new materials and approaches for improved stress corrosion inhibitive coatings for critical stress corrosion prone components of current and future aircraft and missiles. Efforts were undertaken to investigate various approaches such as pH buffering agents, chloride gettering and blocking agents, and stress-corrosion-cracking SCC inhibitors for aluminum 7075-T651 alloy. Porous films were investigated as possible coating holding reservoirs for the SCC protective agents developed. Of the porous films tested, phosphate conversion coatings and aqueous anodized coatings were not satisfactory. Nonaqueous anodiztion in molten alkali nitrate melts provided increased resistance to SCC when compared with samples of similar temper, but some difficulty was experienced with grain growth. Lead phosphate gettered chloride efficiently but was of insufficient capacity for high chloride concentrations. Of the soluble organic acid inhibitors investigated, acetic and acrylic acids showed promise in reducing SCC however, the results were inconsistent. A soluble chromate consistently inhibited SCC. Author
Descriptive Note:
Final technical rept. 15 May 71-14 May 72,
Pages:
0101
Contract Number:
F33615-71-C-1570
File Size:
0.00MB
