Cleaning and liquid contact with solids – Processes – Including application of electrical radiant or wave energy...
Patent
1993-11-02
1995-11-07
Simmons, David A.
Cleaning and liquid contact with solids
Processes
Including application of electrical radiant or wave energy...
134 2, 134 26, 134 29, B08B 308, B08B 312, C11D 724
Patent
active
054644771
ABSTRACT:
The present invention relates to an aqueous composition and process useful for cleaning and drying ferrous surfaces. According to the invention, a water-immiscible hydrocarbon or non-halogenated organic solvent cleaning step is followed by an aqueous displacement solution (ADS) which contains a surfactant component and a pH modifier component in sufficient amounts to substantially displace the hydrophobic organic solvent residue from the surface of the substrate and prevent its redeposition. The ferrous metal surfaces are then rinsed with hot deionized ultrasonically agitated water which comprises one or more water soluble basic components. This aqueous composition is capable of protecting ferrous metal surfaces form flash rusting after aqueous cleaning or solvent treatments of the surfaces, and particularly during the deionized water rinsing and drying steps.
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Chaudhry Saeed T.
Crest Ultrasonics Corporation
Simmons David A.
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