抄録
The author investigated effects of 5% and 10% hydrochloric acid and sulphuric acid solutions, in which 0.1% and 0.2% Urotropin was contained, on the removal of oxide films from cast iron, and illustrated that 10% hydrochloric acid solution conthining 0.2% Urotropin was the most effective. When employing this solution, oxide films were removed perfectly in relatively short time and the metal surface left behind was very smooth.
Then, acid cleaning of turbine parts was performed using the same solution. It was concluded that acid cleaning was more effective than mechanical cleaning.
