This paper analyzes the limitations of weight change techniques at elevated temperature and pressure, and presents a description of a new technique based on the measurement of the hydrogen generated by the corrosion reaction. This H, which diffuses through the walls of a test specimen containing the aqueous solution, is collected and measured in a vacuum system of known volume which surrounds the test specimen; the corrosion rate is calculated from the hydrogen effusion rate. Results obtained with the technique show good reproducibility and compare well with results obtained by an independent method.
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Bloom et al. (1957) studied this question.