Abstract
At the wet ends of paper machines and especially at splash zones, pitting and crevice corrosion of stainless steels caused by chloride (C[Symbol Not Transcribed]) and thiosulphate (S[Symbol Not Transcribed]O[Symbol Not Transcribed]) ions is a common phenomenon. Chloride ions originate from wood floated in sea water, supplied water and chemicals added to the pulp mix. Mechanical pulp brightened with dithionite (S[Symbol Not Transcribed]O[Symbol Not Transcribed]) is the main source of thiosulphate ions (f.1). Thiosulphate pitting is known to occur within a narrow voltage potential range (f.2) and molar ratio [Equation Not Transcribed] (f.3). The most sensitive region for thiosulphate pitting is in the potential range of 0 to -400 mV[Symbol Not Transcribed] (f.4) and molar ratios of 10 to 30 (f.3). To initiate thiosulphate pitting corrosion on type 316L stainless steel the molar ratio [C[Symbol Not Transcribed]]/[SO[Symbol Not Transcribed]] should be [Symbol Not Transcribed]1 (f.3).
| Original language | English |
|---|---|
| Pages (from-to) | 47-50 |
| Number of pages | 4 |
| Journal | Pulp and Paper Canada |
| Volume | 100 |
| Issue number | 4 |
| Publication status | Published - 1999 |
| MoE publication type | A1 Journal article-refereed |