A description is given of a newly designed corrosion testing apparatus to make clear the effect of heat transfer on the corrosion behavior of mild steel in high temperature and high pressure water. The specimen wire was placed in an autoclave and was heated by electric current through it. The heat produced in the specimen was removed by air cooling tube connected to the autoclave.
The corrosion experiment at early stage was carried out under the following conditions: heat transfer was less than 5×10⁵kcal/m²·hr, temperature was 316°C and below, and demineralized water or sodium hydroxide solution at pH 11 was used.
Heat transfer slightly affected the forming of corrosion product and corrosion rate.
Pitting did not appear in all the experimental conditions.
The corrosion product in sodium hydroxide solution indicated better crystallization than that in demineralized water.

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It was found by measuring weight losses of zinc specimens immersed different periods of time in the very slightly acid electrolytes of the zinc-manganese dioxide dry cells that additions of small amounts of ammonium gluconate or gluconamide into the electrolyte were quite effective on the prevention of corrosion of zinc.

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