SURFACE TREATMENT OF METALS, METHOD OF TESTING WITH RADIO-ACTIVE ISOTOPES
GENERAL DYNAMICS SAN DIEGO CA CONVAIR DIV
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An experimental technique is described for nondestructive testing of bond strength for aluminum metal surfaces bonded with organic adhesives. The new technique uses radioactive tracers C14 in stearic acid to determine the amount of soil removed during cleaning operation. It also uses chromate ion Cr51 in FPL solution, sodium dichromate sulfuric acid, during the deoxidizing and etch treatment. The correlation between Cr6 sorbtion and bond strength was demonstrated as approximately linear.
- Fabrication Metallurgy
- Couplers, Fasteners and Joints