Passivation of stainless steels in organosulphonic acid medium

Details Passivation of stainless steels in organosulphonic acid medium Passivation of stainless steels in organosulphonic acid medium

1999-01-12

2000-09-19

Sheehan, John

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

148273, 422 12, C23C 2248

Patent

active

061206199

ABSTRACT:
To avoid the corrosion of stainless steels in organosulphonic acid medium, at least one oxidizing agent selected from cerium(IV), iron(III), molybdenum(VI) or vanadium(V) oxides or salts, nitrites and persulphates, is added to the medium in an amount which is sufficient to place the spontaneous potential between the passivation and transpassivation potentials.

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patent: 4957653 (1990-09-01), Cordani
European Search Report dated Sep. 28, 1998.
"The mechanism of passivating-type inhibitors", Journal of the Electrochemical Societry, vol. 105, No. 11, pp. 638-647, (1958).
B. Gaur, et al., Corrosion of Metals and Alloys in Methane Sulphonic Acid, British Corrosion Journal, 1999, vol. 34, No. 1, pp. 63-66.
European Search Report dated May 7, 1999.
"Corrosion of Stainless Steel During Acetate Production", J.S. Qi and G. C. Lester, Corrosion Engineering, vol. 2, pp. 558-565 (previously cited as unavailable).

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