Chemistry: analytical and immunological testing – Process or composition for determination of physical state... – Surface area – porosity – imperfection – or alteration
Patent
1982-10-29
1985-10-08
Turk, Arnold
Chemistry: analytical and immunological testing
Process or composition for determination of physical state...
Surface area, porosity, imperfection, or alteration
436 83, G01N 2178, G01N 3318
Patent
active
045460876
ABSTRACT:
A method is disclosed for detecting the presence of a chromate coating on the surface of aluminum. The method includes the application of a few milliliters of a liquid composition to the surface of the aluminum. The liquid composition includes one part of potassium permanganate having a concentration of at least 0.5 weight/volume percent and one part of concentrated sodium hydroxide saturated in an aqueous solution. The liquid has a beet-red pigmentation which undergoes a color change to a bright blue-green pigmentation when it reacts with a chromate coating. If no coating is present on the aluminum surface, the liquid will react with the aluminum and the alloys contained therein to produce a beige color.
REFERENCES:
patent: 2902348 (1959-09-01), Ostrander
patent: 4244693 (1981-01-01), Guon
patent: 4287002 (1981-09-01), Torok
patent: 4327134 (1982-04-01), Baldi
patent: 4383042 (1983-05-01), Coggins et al.
Spot Tests by Fritz Feigl, vol. I, Inorganic Applications 1954, pp. 314-337, Elsevier Publishing Co.
Deere & Company
Turk Arnold
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