Metal treatment – Compositions – Heat treating
Patent
1980-12-22
1983-05-24
Albrecht, Dennis L.
Metal treatment
Compositions
Heat treating
148 615Z, 252135, 252136, 25217414, 252527, C11D 712, C11D 716, C23F 708, C23F 710
Patent
active
043849008
ABSTRACT:
This invention is directed to a method for treating metal surfaces. More particularly, this invention is directed to an improved method for cleaning, scouring, and activating metal surfaces prior to phosphatization, which comprises contacting said metal surfaces with an aqueous solution comprising primary and/or secondary alkali metal or ammonium salts of orthophosphates and conventional metal cleaning components, the solution having a pH value of from about 6.3 to 8.2, said pH being lower than the pH value of solutions of the corresponding secondary orthophosphates alone having the same concentration; and containing optionally condensed phosphates in an amount corresponding to the amount necessary to soften the water hardness of the water used.
REFERENCES:
patent: 2329065 (1943-09-01), Lum
patent: 2345307 (1944-03-01), Vitalis
patent: 2462196 (1949-02-01), Jernstedt
patent: 2874081 (1959-02-01), Cavanagh
patent: 3255118 (1966-06-01), Carroll
patent: 3729346 (1973-04-01), Gotta et al.
patent: 3864139 (1975-02-01), Heller
patent: 3888783 (1975-06-01), Rodzewich
patent: 4152176 (1979-05-01), Guhde
Gotta Hans
Gottwald Karl-Heinz
Albrecht Dennis L.
Gerhard Collardin GmbH
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