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51318-11070- Corrosion and SSC Resistant Cladding Material for H2S/CO2 Oil and Gas Containing Environment

Picture for 51318-11070- Corrosion and SSC Resistant Cladding Material for H2S/CO2 Oil and Gas Containing Environment
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The paper summarizes the theoretical and test programs to validate the aluminum cladding solution – developed to overcome sulfide stress corrosion problems in high strength steel armors in H2S/CO2 containing environment.

Product Number: 51318-11070-SG
Author: E. Fallahmohammadi / R. Sica / P. Anelli / F. Casiraghi
Publication Date: 2018
Industry: Materials Selection and Design
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$20.00
$20.00

For the first phase of the Project solution has been developed to overcome sulfide stress corrosion problems in high strength steel armors in H2S/CO2 containing environment. The solution consists of protecting high strength steel armor elements with an aluminum cladding produced by method of Conform. This cladding has been shown to be fully H2S tolerant and capable to maintain bare steel in condition of electrochemical immunity (cathodic protection). The present paper summarizes the theoretical framework and the test programs worked out to validate the aluminum cladding solution.

Results of the First Phase of the Project: The test coupons made of metallic armor material for each category were also exposed individually to corrosive environment for corrosion rate test. H2S has been proven to be not reactive with the aluminum coating in water environment up to 1 bar partial pressure. Aluminum clad high strength steel strips (Y 0,2%~1000MPa and ~ 200 <m cladding thickness) passes NACE TM0177 sulfide stress corrosion cracking (SSCC) test purged with 0,9 bar CO2 - 0,1 bar H2S gas mixture (720 hours, pH 4, four point bending at 90% Y0,2%,). The same high strength steel strips without aluminum cladding doesn’t pass the test. Al clad high strength steel strips passes the extension of NACE TM0177 test to 1440 , 2160 and 3000 hours. In case of mechanical damage of the cladding, the remaining aluminum cladding is capable to cathodically protect the exposed steel

 Key words: H2S, CO2, Sour Service, Hydrogen Embrittlement, Sulfide Stress Cracking, Hydrogen induced cracking, High Strength Steels

 

For the first phase of the Project solution has been developed to overcome sulfide stress corrosion problems in high strength steel armors in H2S/CO2 containing environment. The solution consists of protecting high strength steel armor elements with an aluminum cladding produced by method of Conform. This cladding has been shown to be fully H2S tolerant and capable to maintain bare steel in condition of electrochemical immunity (cathodic protection). The present paper summarizes the theoretical framework and the test programs worked out to validate the aluminum cladding solution.

Results of the First Phase of the Project: The test coupons made of metallic armor material for each category were also exposed individually to corrosive environment for corrosion rate test. H2S has been proven to be not reactive with the aluminum coating in water environment up to 1 bar partial pressure. Aluminum clad high strength steel strips (Y 0,2%~1000MPa and ~ 200 <m cladding thickness) passes NACE TM0177 sulfide stress corrosion cracking (SSCC) test purged with 0,9 bar CO2 - 0,1 bar H2S gas mixture (720 hours, pH 4, four point bending at 90% Y0,2%,). The same high strength steel strips without aluminum cladding doesn’t pass the test. Al clad high strength steel strips passes the extension of NACE TM0177 test to 1440 , 2160 and 3000 hours. In case of mechanical damage of the cladding, the remaining aluminum cladding is capable to cathodically protect the exposed steel

 Key words: H2S, CO2, Sour Service, Hydrogen Embrittlement, Sulfide Stress Cracking, Hydrogen induced cracking, High Strength Steels

 

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51318-11477-Corrosion evaluation of tubing steels and material selection in the CO2/H2S coexistent environment

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Author: Nai-yan ZHANG / Zhi ZHANG / Wen-tao ZHAO / Lian LIU / Taihe SHI
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To evaluate the applicability of the tubing steels, the corrosion behavior and stress corrosion cracking of tubing steels (P110S, P110-13Cr and duplex stainless steel 2205) were investigated under different H2S partial pressures and temperature.
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Design Challenges for Material Selection in Sour and High Salinity Gas and Oil Production Facilites

Product Number: 51317--9244-SG
ISBN: 9244 2017 CP
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This paper addresses the challenges to provide example of engineering solutions through the use of corrosion resistant alloys and non metallic materials to maintain the integrity of flowlines and process equipment in severe sour service.
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51318-10990-Localized Corrosion of Mild Steel under Iron Sulfide Layers in CO2/H2S Environment

Product Number: 51318-10990-SG
Author: Saba Navabzadeh Esmaeely / Gheorghe Bota / Bruce Brown / Srdjan Nesic
Publication Date: 2018
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Mild steel specimens (API 5L X65) were pretreated to form a pyrrhotite layer on the surface using high temperature sulfidation in oil, then exposed to a range of aqueous CO2 and H2S corrosion environments, leading to initiation of localized corrosion.

 
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