Effect of Anions and Organic Corrosion Inhibitors on the Rate of Hydrogen Penetration of Iron

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Abstract
The rates of hydrogen penetration of annealed iron in different acids (pH 0.3), H2SO4, HCl, HClO4, and H3PO4, in the absence and presence of the organic compounds, benzotriazole, methylhydroxypentyne, and thiourea, have been measured. Although the differences in the hydrogen penetration rates of iron in the strong acids are not substantial, the penetration rate of iron in H3PO4 is significantly larger than that measured in the three strong acids. Both Benzotriazole (BTA) and methylhydroxypentyne (MHP) retard hydrogen penetration in all three strong acids. On the other hand, thiourea (TU) substantially accelerates penetration due to the presence of H2S. Anion effects on hydrogen penetration are small in the presence of BTA and MHP, while they are insignificant in the presence of TU.

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