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US 4,067,751 AGranted
Aqueous NaCl test solution for aluminum and its alloys
AssigneeVereinigte Metallwerke Ranshofen-Berndorf Aktiengesellschaft
InventorWilhelm Pistulka
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Abstract
A corrosive solution, designed to accelerate the rupture of workpieces of aluminum and its alloys in stress-corrosion-cracking tests, contains sodium chloride, hydrogen peroxide and sodium acetate dissolved in water, with maintenance of an acidic pH.
Drawings
Claims2
A method of accelerating stress corrosion cracking of metallic workpieces of aluminum or its alloys for the detection of stress-corrosion cracks therein which comprises immersing said workpieces under stress in a solution consisting essentially of the following ingredients in water:
- NaCl in a proportion ranging between substantially 0.5% and 5% by weight;
- H.sub.2 o.sub.2 in a proportion ranging between substantially 0.1% and 1% by weight;
- and
- NaOH and CH.sub.3 COOH interreacting to produce sodium acetate, said NaOH being present in a concentration substantially exceeding that of the NaCL, said CH.sub.3 COOH being present in an amount such that the pH of the solution is maintained between 1 and 7.
1 more element
Dependencies are inferred from the claim text.