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Suggestions needed for inhibitor system during pickling
We occasionally have to cast small tools from tool steel. After the tools are cast, we need to remove the scale on the steel which we do by pickling the tools in 5% sulfuric acid. The question is whether anyone can suggest a cheap way of introducing an inhibitor into the sulfuric bath so that the acid does not attack the cleaned metal.
- Buffalo, New York
One of the best inhibitors for steel is 1:4 Butyne-diol, used at between 0.1 and 0.5%. You should be able to obtain the material from laboratory suppliers. Alternatively it was the component of many bright nickel brighteners.
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