304L Corrosion
304L Corrosion
(OP)
I have some air distribution nozzles constructed of 304L for a fluidized bed that have begun to show significant corrosion. We have seen a loss an average of 0.14" of material on a 1.31" OD nozzle. Metal losses come off in small flakes. The corrosion is fairly localized to a 2-3" band. This band happens to be where extra machining and wire-brushing has been performed, but also sees the most potential for higher temp and abrasion.
Could this much material loss be due to lack of passivation or a fabricator being unscrupulous in his use of carbon steel bits and wire brushes, or is it likely due to a different phenomenon? Thanks for the input.
Could this much material loss be due to lack of passivation or a fabricator being unscrupulous in his use of carbon steel bits and wire brushes, or is it likely due to a different phenomenon? Thanks for the input.





RE: 304L Corrosion
RE: 304L Corrosion
RE: 304L Corrosion
Sounds like the mix of fretting corrosion (corrosion increasing wear, wear increasing exposed surface and thus increasing further corrosion) and high temperature oxidation, but as others said, without a deeper view, it's just a work of guess.