The localised corrosion resistance (pitting and crevice corrosion) of two high alloy stainless steels, namely superduplex (SD) and superaustenitic (SA), has been studied in chloride-fluoride solutions at pH values ranging from 2 to 6.5. The pitting potential (E pit ) and crevice potential (E cre ) h
Corrosion behaviour of highly alloyed stainless steels in mixed chloride and fluoride aqueous solutions
โ Scribed by J. M. Bastidas; C. Fosca; B. Chico; E. Otero
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- German
- Weight
- 510 KB
- Volume
- 48
- Category
- Article
- ISSN
- 0947-5117
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โฆ Synopsis
Abstract
Laboratory weight loss and cyclic potentiodynamic polarization corrosion tests were performed on two types of corrosion resistant alloys, a duplex alloy (ferriticโaustenitic stainless steel) and two austenitic stainless steels, in mixtures of chloride (3000, 9000 and 15000 ppm) and fluoride (4800 and 15000 ppm) ions at pH 3. Two temperatures were tested, 60 and 70ยฐC. The electrochemical results indicate that the duplex stainless steel presents high corrosion resistance. Weight loss results show low corrosion rates of the two types of stainless steels after 60 days exposure. Sonic pitsโcrevices were found under the corrosion crust deposits on the duplex stainless steel.
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