In this research, stress corrosion cracking (SCC) and corrosion behaviour of API 5L X52 carbon steel in 25 wt-% diethanolamine solution, saturated/unsaturated with carbon dioxide and containing 0 and 200 ppm hydrogen sulphide at different temperatures were investigated using slow strain rate test, electrochemical measurement and microscopic analysis. In addition, the presence of heat stable amine salts (HSASs) in the test solution was studied using spectrophotometry and Fourier transform infra-red spectroscopy. Analysis of the results showed that the primary components to form HSASs exist in the solution. The results indicated that SCC is more likely in solutions without amine. Increase in corrosion rate of carbon steel by increase in temperature was clearly observed and concluded that the simultaneous presence of hydrogen sulphide and carbon dioxide in the solution can increase the corrosion rate of carbon steel more than having one of the gases in the solution.
KohlALNielsenR.Gas purification. 5th ed.Houston: Gulf Professional Publishing; 1997.
2.
Garcia-ArriagaVAlvarez-RamirezJAmayaMH2s and O2 influence on the corrosion of carbon steel immersed in a solution containing 3M diethanolamine. Corr Sci.2010; 52: 2268–2279. doi: 10.1016/j.corsci.2010.03.016
3.
ForoulisZ.Stress corrosion cracking in amine acid gas scrubbing units. Anti Corros Methods Mater. 1990; 37: 4–12. doi: 10.1108/eb007284
4.
KittelJFleuryEVuilleminBCorrosion in alkanolamine used for acid gas removal: from natural gas processing to CO2 capture. Mater Corros.2012; 63: 223–230. doi: 10.1002/maco.201005847
5.
RawatJRaoPVChoudaryN.Controlling corrosion in amine treatment units. Pet Technol.2011; 12: 35.
6.
MokhatabSPoeWA.Natural gas fundamentals, handbook of natural gas transmission and processing. Amsterdam: Elsevier; 2012.
7.
NielsenRLewisKMcCulloughJGControlling corrosion in amine treating plants. Presented at Proceedings of the Laurance Reid Gas Conditioning Conference, Norman, Oklahoma; 1995 .
8.
QiYYangJZhangCStress corrosion cracking behaviour of 316L stainless steel exposed to CO2–H2S–Cl− environments in the absence and presence of methyldiethanolamine (MDEA). Corros Eng Sci Technol. 2016; 51: 507–512. doi: 10.1080/1478422X.2016.1152747
9.
HuangXQiYChenCEffect of environmental factors on corrosion behaviour of L360QCS pipeline steel in H2S/CO2 environments. Corros Eng Sci Technol.2015; 50: 169–177. doi: 10.1179/1743278215Y.0000000011
10.
PalPBanatF.Comparison of thermal degradation between fresh and industrial aqueous methyldiethanolamine with continuous injection of H2S/CO2 in high pressure reactor. J Nat Gas Sci Eng.2016; 29: 479–487. doi: 10.1016/j.jngse.2016.01.037
11.
DavoudiMSafadoustARMansooriSAAThe impurities effect on thermal degradation and corrosivity of amine solution in south pars gas sweetening plants. J Nat Gas Sci Eng. 2014; 19: 116–124. doi: 10.1016/j.jngse.2014.05.001
12.
HatchellD.Thermal degradation and corrosion of amines for CO2 capture [Ph.D. thesis]. Austin: University of Texas; 2015.
13.
HarstonJRopitalF.Amine unit corrosion in refineries. Cambridge: Elsevier; 2007.
NACE TM0198. Slow strain rate test method for screening corrosion-resistant alloys (CRAs) for stress corrosion cracking in sour oilfield service. Houston (TX): NACE International; 2004.
16.
ForoulisZ.Stress corrosion cracking behaviour of carbon steel in aqueous dipa and in dipa-sulfolane-water solutions. Zairyo-to-Kankyo. 1992; 41: 550–556. doi: 10.3323/jcorr1991.41.550
17.
KaneRD.Slow strain rate testing for the evaluation of environmentally induced cracking: research and engineering applications. West Conshohocken (PA): ASTM International; 1993.
18.
SocratesG.Infrared and Raman characteristic group frequencies: tables and charts. West Sussex: John Wiley & Sons; 2004.
19.
API RP 581. Risk-based inspection technology. Washington (DC): American Petroleum Institute; 2008.
20.
IslamMYusoffRAliB.Degradation studies of amines and alkanolamines during CO2 absorption and stripping system. Eng e-Trans. 2010; 2: 97–109.
21.
RennieS.Corrosion and materials selection for amine service. Presented at Materials and Testing Conference, Fremantle, Australia; 2006.
22.
NessCAWhiteLRGriffieSW. THEED degradation of diethanolamine. Presented at NACE International, Salt Lake City, Utah; 2012.
23.
JavidiMLalehparvarMGhassemiA.The effect of temperature and acid gas loading on corrosion behaviour of API 5L X52 carbon steel in amine unit. J Mater Eng Perform. 2016; 25: 1794–1801. doi: 10.1007/s11665-016-2017-4
24.
CummingsALVeatchFCKellerAE. Corrosion and corrosion control methods in amine systems containing H2S. Presented atCorrosion Conference, NACE International, Salt Lake City, Utah; 1997.
25.
ContrerasAAlbiterASalazarM. Assessment of stress corrosion cracking on pipeline steels weldments used in the petroleum industry by slow strain rate tests. New York City: Intech Open Access Publisher; 2011.
26.
KoteeswaranM. CO2 and H2S corrosion in oil pipelines [master thesis]. Stavanger: University of Stavanger; 2010.
27.
ParkinsRForoulisZ. Stress corrosion cracking of mild steel in monoethanolamine solutions. Mater Perform. 1988; 27: 19–29.
28.
API RP 945. Avoiding environmental cracking in amine units. Washington (DC): American Petroleum Institute; 2003.
ForoulisZA.Stress corrosion cracking of carbon steel in aqueous diethanolamine and monoethanolamine solutions. Boshoku Gijutsu. 1989; 38: 9–18.
31.
LuBSongFGaoMCrack growth model for pipelines exposed to concentrated carbonate–bicarbonate solution with high pH. Corros Sci.2010; 52: 4064–4072. doi: 10.1016/j.corsci.2010.08.023
32.
DavisJRochelleG.Thermal degradation of monoethanolamine at stripper conditions. Energy Procedia. 2009; 1: 327–333. doi: 10.1016/j.egypro.2009.01.045
