The corrosion behaviour of a number of materials exposed to bromine-containing environments

✍ Scribed by T. Hodgkiess; N.K. Ng; P. Argyropoulos

• Publisher: Elsevier Science
• Year: 1985
• Tongue: English
• Weight: 967 KB
• Volume: 55
• Category: Article
• ISSN: 0011-9164
• DOI: 10.1016/0011-9164(85)80075-8

✦ Synopsis

A laboratory investigation has been carried out on the corrosion behaviour of a number of materials exposed to environments containing bromine at temperatures of 16-60C .

The aim of the investigation has been to identify materials with higier resistance to corrosion in such environments than 316L stainless steel which has been reported in recent years to have suffered serious deterioration in parts of MSF plants in which bromine is present . Thus a number of higher- alloy stainless steels of the austenitic, ferritic and duplex type have been included, together with Incoloy 825 and titanium, in the study .

In order to obtain information on the resistance to different types of corrosion, the behaviour of plain specimens and U-bend samples containing artificial crevices have been studied . The investigation has involved detailed examination of specimens after extended periods of exposure in an environment containing 1000ppn of dissolved bromine . Additionally, relatively rapid electrochemical experiments have been carried out .

The results have indicated significant differences in corrosion behaviour between the various materials with some of the higher-alloy stainless steels, and titanium, exhibiting distinctly improved corrosion behaviour in comparison with the conventional 316L grade . Where corrosion occurs, it has been observed to be generally significantly worse in the vapour space than in completely submerged conditions .

The results are discussed both in terms of the operative corrosion mechanisms and with a view to obtaining comprehensive rankings of the materials in relation to their potential for plant application .