Thank you Ajit, I am looking for pitting/SCC in wet bromine, hydrobromic acid. I would expect it to act like chlorine. Thank you for the reference, I will search for it.
The question arises from the Petrochemical industry, where bromine is an additive. The investigation is around the failure of a 304L liner in a carbon steel vessel (SA 516-70). The liner deteriorated in one area, probably one of high flow that affected the removal of the passive film. Interesting item is that no oxygen (air) is added to the process, although water is present.
Refining and Petrochemical Engineer and Chief Inspector
Becht Engineering Inc., Co.
Intergranular cracking in a local area. I am sorry I can not share the limited process data I know about, other than bromine is there with organics and water.
Are other oxidizers present? Digby McDonald 's group did a lot of work on halides and corrosion at Penn State when I was there, late 90s. I think his focus was pitting corrosion, but they may have also addressed cracking.
Another thought, if its aligned along the welds, I've seen PWC that looks like cracking on lined vessels. This was acetic acid service and due to tramp halides including iodide and chloride. The source of iodide was degraded catalyst.
Krista L. Heidersbach
Sr Engineer, Corrosion, Asset Integrity
O: (+1) 832-765-4423 | M: (+1) 832-454-8460
HQ-08-S850-04 | 2331 CityWest Blvd | Houston, TX 77042-2862
I am not aware of any oxidizers in the process
Good information , Thank You sir
There is some information on bromide SCC in the MTI publication "Environmental Cracking", on p. 94-95. This cites a study by M. Kudama of Yamaguchi University, who studied U-bends of various alloys with various concentrations of bromides, chlorides and oxygen. His conclusions were that to prevent Bromide SCC of austenitic stainless steels, dissolved oxygen must be kept below 0.1 ppm. Pitting and transgranular SCC were observed on 304 and 316 SS's if bromide concentration exceeded 50 ppm. Chlorides were much more aggressive than bromides at all test conditions. Under the most severe conditions, Hastelloy C-275 was found to be the most resistant material tested.
Thank you Dale, all good information