Process for removing copper and copper oxide encrustations from

Details Process for removing copper and copper oxide encrustations from Process for removing copper and copper oxide encrustations from

1981-11-12

1984-04-17

Caroff, Marc L.

Cleaning and liquid contact with solids

Processes

For metallic, siliceous, or calcareous basework, including...

134 3, 134 28, 134 29, 134 41, C23G 108, C23G 120

Patent

active

044432682

ABSTRACT:
Aqueous alkaline solutions containing ferric chelates of alkylenepolyamine polycarboxylic acids (e.g. EDTA) have been used to remove plated copper from freshly cleaned ferrous metal surfaces. Normally, an oxidant is added during the copper removal stage to oxidize ferrous ion to the ferric state. This process is improved by adding aqueous hydrogen peroxide to the flowing cleaning solution at a rate such that the solution EMF (platinum or iron versus a saturated calomel electrode), as measured at about 80.degree. F. and at a solution pH of about 9.2, becomes more positive than -250 mV in about one hour.

REFERENCES:
patent: 3413160 (1968-11-01), Teumac
patent: 3438811 (1969-04-01), Harriman et al.

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