Process for detecting soft spots in aluminum

Details Process for detecting soft spots in aluminum Process for detecting soft spots in aluminum

1981-07-16

1983-05-10

Marcus, Michael S.

Chemistry: analytical and immunological testing

Process or composition for determination of physical state...

Surface area, porosity, imperfection, or alteration

73104, 252960, G01N 3320, G01N 1908

Patent

active

043830420

ABSTRACT:
A process and compositions for detecting improperly processed areas in heat treated aluminum are disclosed. A solution containing an acid or a base and an oxidizing agent and, if desired, a color enhancing ingredient is applied to an aluminum object to produce a color difference between those areas of the surface of the object which have been properly hardened and the areas resulting from improper heat treatment. The solution can be applied to the aluminum by brushing, swabbing, immersion or spraying. The acid or base in the solution attack the aluminum surface so that the oxidizing agent in the solution can react with the aluminum to produce the aforementioned color differential.

REFERENCES:
patent: 2391522 (1945-12-01), Slunder
patent: 3652224 (1972-03-01), Johnson et al.
patent: 3652225 (1972-03-01), Coffin, Jr. et al.
patent: 3652226 (1972-03-01), Coffin, Jr. et al.
patent: 4067751 (1978-01-01), Pistulka

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