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Monday, March 15, 2010: 2:15 PM
217 D (Henry B. Gonzales Convention Center)
Corrosion of the 304L Stainless Steel Trays in an Amine Unit
Jeffrey Xie*, Bill Santos, Katherine Ikeda, Vasily Simanzhenkov
NOVA Chemicals Research & Technology Center (NRTC)
2928 16 Street NE, Calgary AB CANADA T2E 7K7
* Email: xiejeff@novachem.com
Tel: 1-403-250-4511
Lorrie Davies, Jeff Kluthe
NOVA Chemicals Corporation, Joffre, AB, CANADA T4N 6A1
Some stainless steel trays were found corroded in an Amine unit during a turnaround in one of NOVA Chemicals plants. Various techniques, XRD, SEM/EDX, TGA-FTIR, ICP-MS, were used to characterize the corrosion and analyze the corrosion products.
The corrosion products were confirmed mainly FeCO3 with some contaminants, roughly 60 wt% solid components at the end of TGA-FTIR. Intergranular corrosion was revealed generally on the surface of the corroded trays. Sulphur-containing compounds then penetrated in the steel along the attacked grain-boundaries. Further corrosion products caused by the sulphur-containing species resulted into cracks along the grain-boundaries of the steel. The formed dry-mud-like material started to fall off. As a result, shallow pits were formed on the surface. With the growth of the shallow pits horizontally and vertically, pits coalesced on the surface and thus resulted in material wastage.
Jeffrey Xie*, Bill Santos, Katherine Ikeda, Vasily Simanzhenkov
NOVA Chemicals Research & Technology Center (NRTC)
2928 16 Street NE, Calgary AB CANADA T2E 7K7
* Email: xiejeff@novachem.com
Tel: 1-403-250-4511
Lorrie Davies, Jeff Kluthe
NOVA Chemicals Corporation, Joffre, AB, CANADA T4N 6A1
Some stainless steel trays were found corroded in an Amine unit during a turnaround in one of NOVA Chemicals plants. Various techniques, XRD, SEM/EDX, TGA-FTIR, ICP-MS, were used to characterize the corrosion and analyze the corrosion products.
The corrosion products were confirmed mainly FeCO3 with some contaminants, roughly 60 wt% solid components at the end of TGA-FTIR. Intergranular corrosion was revealed generally on the surface of the corroded trays. Sulphur-containing compounds then penetrated in the steel along the attacked grain-boundaries. Further corrosion products caused by the sulphur-containing species resulted into cracks along the grain-boundaries of the steel. The formed dry-mud-like material started to fall off. As a result, shallow pits were formed on the surface. With the growth of the shallow pits horizontally and vertically, pits coalesced on the surface and thus resulted in material wastage.