Tin stripping method
AssigneeUwin Nanotech Co., Ltd.
InventorChing-Hsiang Hsu
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Abstract
The present invention provides an additive for tin stripping, comprising 0.1 to 20 wt % of copper corrosion inhibitor and 0.1 to 20 wt % of nickel corrosion inhibitor; wherein said weight percentage is based on the total weight of said additive. The present additive can be used with nitric acid conventionally used for metal-stripping for not only reducing the usage of nitric acid but also improving the efficiency of tin stripping. The present invention also provides a method for Tin recycle and a reaction tank for metal recycle. Both of them are favorable for satisfying the needs of metal recycle (especially, tin recycle) in the field.
Claims10
A method for tin-stripping, comprising
- providing a stripping solution comprising 20 to 50% (v/v) of nitric acid and 20 to 50% (v/v) of a stripping additive;
- wherein said stripping additive comprises, by weight of said stripping additive:
- 0.1 to 20 wt % of trisodium phosphate;
- 0.1 to 20 wt % of potassium carbonate;
- and
- remaining wt % of said stripping additive is a solvent;
- immersing an object having tin in said stripping solution to obtain a wash-off solution;
- and
- collecting said wash-off solution.
Dependencies are inferred from the claim text.