Coating processes – With pretreatment of the base – Metal base
Patent
1977-01-27
1979-01-23
Kendall, Ralph S.
Coating processes
With pretreatment of the base
Metal base
427239, 134 10, 134 40, 134 28, 2604125, 252358, C23G 500
Patent
active
041362179
ABSTRACT:
In a continuous process wherein corrosion resistant and paint adherent coatings are formed on metallic articles and wherein prior to the formation of said coatings, the articles are first subjected to a pre-cleaning stage in which oil emulsion is removed from the surfaces of the articles by washing the articles with an aqueous solution of wash water and demulsifier and the removed oil emulsion is broken and the oil recovered, and wherein the articles having the oil emulsion removed from their surfaces are thereafter subjected to a second cleaning stage in which the articles are contacted with a cleaning solution to remove metal fines from the surfaces of the articles, the improvement comprising including a chelating agent in said aqueous solution of wash water and demulsifier to aid in breaking said oil emulsion and to deter or prevent the formation of precipitates in the cleaning solution of said second cleaning stage.
REFERENCES:
patent: 2711978 (1955-06-01), Groom
patent: 3025190 (1962-03-01), Groom
patent: 3450086 (1969-06-01), Maddock
patent: 3964936 (1976-06-01), Das
patent: 4082867 (1978-04-01), Henley et al.
Amchem Products
Carlson Dale Lynn
Kendall Ralph S.
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