Letter 30068

Chart for corrosion of mild steel with sulphuric acid  

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Sir,

Do you have any data on corrosion of mild steel with sulphuric acid , with changes in temperature of the acid? Preferably some chart? We pump 98 to 99 % sulphuric acid at 40 to 90 degree centigrade through MS pipes and we need this data.

PRADEE PKUMR .P
Chemical industry - Trivandrum, KERALA, INDIA

Hi Pradee,

Am not sure but I don't think you'll get a chart like you want.

I would personally be not so afraid of the temperature but scared witless if your concentration dropped. .... that's when Sulphuric tends to become very agressive with metals. Even an airlock (ie. raised horizontal pipe with a 90 degree downcomer) will definitely cause problems in the long term. Have you checked at all with the suppliers of your sulphuric?

Freeman Newton
- White Rock, B.C. Canada

If you are sending sulphuric acid for long distance, I prefer to increase the concentration of acid. Try sending 100 to 105% H2SO4.(Per sulfat). It is cheap.

Juzac Jessu
- Jakarta, Indonesia

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