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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.

Raj Patel
- Buffalo, New York
2000

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.

Tom KInsman
- UK
2000

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