Interactions between certain stainless steels (UNS S30400, S31603,
S32205, S32304, hard chromium plated S31603, hard chromium plated S32205) and
sulphur anions were investigated in synthetic liquors. The X-Ray
Fluorescence (XRF) and Contact Electric Resistance (CER) techniques were used
to study the sulphur rich layer of stainless steels formed during immersion.
Ion Chromatography (IC), Ion Selective Electrodes (ISE) and ABC titration
were adapted the modelling behaviour of the sulphur anions. Hydroxide content
was found to correlate linearly with the adhesion of sulphur onto steel.
Impact of sulphide was evident, but non-linear. For the solution, real
amount of sulphide was less than the added amount. Thiosulphate had a
tendency to convert into sulphite. The adhesion increased in the following
order: S32304, S32205, S30400 and S31603. Film forming on S30400 possessed
in most cases the highest film resistance properties measured by CER. Hard
chromium plated steels appeared to be chemically inert.
|Conference||10th International Symposium On corrosion in the Pulp and Paper Industry, ISCPPI |
|Abbreviated title||10th ISCPPI|
|Period||21/08/01 → 24/08/01|