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97513 EFFECTS OF RESIDUAL ELEMENTS ON THE CORROSION RESISTANCE OF STEELS IN HF

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Product Number: 51300-97513-SG
ISBN: 97513 1997 CP
Author: G. Chirinos, S. Turgoose, R.C. Newman
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The effects of Cu, Ni and Cr alloying on HF corrosion were studied using special low-carbon alloys, and the results compared with two commercial steels that had shown dtierent resistance in HF alkylation service. Three HF concentrations (60%, 90% and 98.4%)and two temperatures (room temperature and 90°C) were used. The electrochemical techniques were impedance spectroscopy, polarization curves and zero-resistance ammetry of coupled electrodes. Long-term immersion tests in 60% HF were used to study the fluoride scales in cross-section. In deoxygenated 98.4% acid, the most notable results were a beneficial effect of Ni in the pure steels and a strong detrimental effect of carbon in the commercial steels. In 90% acid Cu and C were both detrimentrd. In 60%acid at 90°C, Cr and C were beneficial. Oxygen addhion to the 60% acid at room temperature caused a very high average corrosion rate and massive high-density pitting, out of all proportion to the supply of oxygen to the surface, suggesting that the salt film was destroyed by oxygen. The commercial steels had higher potentials and formed different coloured fluoride scales these observations are associated with the introduction of carbides into the scale. Kevwords: Hydrofluoric acid, corrosion, steel, alloying effects, alkylation surface film
The effects of Cu, Ni and Cr alloying on HF corrosion were studied using special low-carbon alloys, and the results compared with two commercial steels that had shown dtierent resistance in HF alkylation service. Three HF concentrations (60%, 90% and 98.4%)and two temperatures (room temperature and 90°C) were used. The electrochemical techniques were impedance spectroscopy, polarization curves and zero-resistance ammetry of coupled electrodes. Long-term immersion tests in 60% HF were used to study the fluoride scales in cross-section. In deoxygenated 98.4% acid, the most notable results were a beneficial effect of Ni in the pure steels and a strong detrimental effect of carbon in the commercial steels. In 90% acid Cu and C were both detrimentrd. In 60%acid at 90°C, Cr and C were beneficial. Oxygen addhion to the 60% acid at room temperature caused a very high average corrosion rate and massive high-density pitting, out of all proportion to the supply of oxygen to the surface, suggesting that the salt film was destroyed by oxygen. The commercial steels had higher potentials and formed different coloured fluoride scales these observations are associated with the introduction of carbides into the scale. Kevwords: Hydrofluoric acid, corrosion, steel, alloying effects, alkylation surface film
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03651 Specification for Carbon Steel Materials for Hydrofluoric Acid Alkylation Units

Product Number: 51300-03651-SG
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