Korrelationsbetrachtungen zum Einfluß von Säureinhibitoren auf die Metallauflösungsgeschwindigkeit und die Kinetik der Wasserstoffabsorption

Considerations on the correlations between inhibition of metal dissolution and hydrogen absorption in the use of acid inhibitors Evaluating literature data on the impact of 53 quarternary ammonium salts, 13 aliphatic and aromatic aldehydes and 12 aliphatic and aromatic ketones on the inhibition of the rate of metal dissolution and the hydrogen permeation currents at steel in H₂S-free and H₂S-saturated 16% hydrochloric acid at ambient temperature, it is demonstrated by rank correlation considerations that there is no correlation between activity in blocking the metal dissolution rate and efficiency in decreasing the hydrogen absorption rate of the metal. Furthermore, there is no correlation between antipromotor/promotor-efficiency at the free corrosion potential and at cathodic polarization in H₂S-free and H₂S-saturated acid. Problems of H-absorption therefore have to be investigated for any particular case under conditions as close to the practice as possible.