Cleaning and liquid contact with solids – Processes – For metallic – siliceous – or calcareous basework – including...
Patent
1996-06-13
1999-05-18
Achutamurthy, Ponnathapura
Cleaning and liquid contact with solids
Processes
For metallic, siliceous, or calcareous basework, including...
134 2, 134 41, 134 42, C23G5/04
Patent
active
059041579
ABSTRACT:
A copper surface pickling process is improved by providing most of the oxidizing agent (such as hydrogen peroxide) used in the process in a separate bath following a primarily acid bath. The temperature of the separate hydrogen peroxide bath can be kept lower, which reduces hydrogen peroxide loss and therefore consumption. After the hydrogen peroxide bath, the copper surface is subjected to high pressure rinsing, including a final stage in which purified (e.g., distilled) water is used.
REFERENCES:
patent: 2856275 (1958-10-01), Otto
patent: 4754803 (1988-07-01), Escobar, Jr. et al.
Appadwedula Ramana V.
Brown Emory C.
Meseha George M.
Travares Fausto V.
Achutamurthy Ponnathapura
Jackson Robert R.
Phelps Dodge Industries, Inc.
Wessendorf T. D.
Zullow Keith A.
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