Hydrogen Content of Steels in Acidic Solution

Abstract

The hydrogen content of JIS-50C steel was measured in H₂SO₄ and HCl aqueous solutions of various concentrations using an electrochemical measurement technique. The hydrogen content increased with an increase in the HCl concentration and rapidly increased as the HCl concentration increased beyond that of a 3 N solution. The hydrogen content increased slowly with an increase in the H₂SO₄ concentration, but did not increase rapidly even when the H₂SO₄ concentration increased beyond 3N. The hydrogen content did not change significantly even when the temperature of the aqueous acid solution increased from 30 to 60°C. The hydrogen content was greater in the HCl solution than in the H₂SO₄ solution when the acid concentration was greater than 2.5N.