Menu
Search
Filters
Close
Menu

51318-10548-Localized Corrosion of Mild Steel in Marginally Sour Environments

Picture for Localized Corrosion of Mild Steel in Marginally Sour Environments
Available for download

In the current study, mild steel specimens (API 5L X65) were exposed to a 1 wt% NaCl solution sparged at 0.096 MPa pCO2 and 15 ×10-6 MPa or less pH2S (≤ 150 ppm H2S/CO2).

Product Number: 51318-10548-SG
Author: Saba Navabzadeh Esmaeely / Wei Zhang / Bruce Brown / Marc Singer / Srdjan Nesic
Publication Date: 2018
Industry: Science of Corrosion
$0.00
$20.00
$20.00

Localized corrosion has been a challenge for the integrity of mild steel pipelines, specifically at operating conditions where a trace amount of H2S is present alongside CO2 at lower temperatures. The presence of H2S leads to formation of a protective iron sulfide layer that decreases the general corrosion rate; however, a trace amount of H2S may only lead to a partially protective mackinawite layer that could result in localized corrosion. In the current study, mild steel specimens (API 5L X65) were exposed to a 1 wt% NaCl solution sparged at 0.096 MPa pCO2 and 15 ×10-6 MPa or less pH2S (≤ 150 ppm H2S/CO2). At pH 5.0 and 30oC the bulk solution was under-saturated with respect to iron sulfide - mackinawite and iron carbonate. At these marginally sour conditions, a H2S/CO2 threshold of approximately 100 ppm was deduced, below which localized corrosion happened. At the tested conditions no localized corrosion occurred for the same environmental conditions when H2S/CO2 ratio was above 100 ppm or when there was no H2S present.

Localized corrosion has been a challenge for the integrity of mild steel pipelines, specifically at operating conditions where a trace amount of H2S is present alongside CO2 at lower temperatures. The presence of H2S leads to formation of a protective iron sulfide layer that decreases the general corrosion rate; however, a trace amount of H2S may only lead to a partially protective mackinawite layer that could result in localized corrosion. In the current study, mild steel specimens (API 5L X65) were exposed to a 1 wt% NaCl solution sparged at 0.096 MPa pCO2 and 15 ×10-6 MPa or less pH2S (≤ 150 ppm H2S/CO2). At pH 5.0 and 30oC the bulk solution was under-saturated with respect to iron sulfide - mackinawite and iron carbonate. At these marginally sour conditions, a H2S/CO2 threshold of approximately 100 ppm was deduced, below which localized corrosion happened. At the tested conditions no localized corrosion occurred for the same environmental conditions when H2S/CO2 ratio was above 100 ppm or when there was no H2S present.

Product tags
Also Purchased
Picture for OPTIMIZED COSTING OF CORROSION CONTROL METHODS IN OIL AND GAS FACILITIES
Available for download

51318-10593-OPTIMIZED COSTING OF CORROSION CONTROL METHODS IN OIL AND GAS FACILITIES

Product Number: 51318-10593-SG
Author: Arun S. Agarwal / Gerry Koch / Narasi Sridhar / Abdulhameed Al-Hashem
Publication Date: 2018
$20.00

A case study is presented for the Life Cycle Costing (LCC) analysis to quantify and compare different corrosion mitigation methods. Strategies to minimize the costs due to corrosion are included.
Picture for Quality & Performance Review of Duplex Stainless Steel Products – An End Users Perspective
Available for download

51318-10568-Quality & Performance Review of Duplex Stainless Steel Products – An End Users Perspective

Product Number: 51318-10568-SG
Author: Janardhan Rao Saithala / Gurram Bhaskar Rao / Manoj Suryanarayana / Talal Nebhani / Pedro Rincon / Nasser Behlani / Mohammed Ghafri / Amjad Kharusi
Publication Date: 2018
$20.00

Quality assurance and procurement & construction challenges associated with DSS materials and operational best practices to ensure integrity and meet intended design life cycle of DSS components.

 
Picture for A Comparison of Chemistries Intended to Treat Reservoir Souring
Available for download

51318-10586-Mechanistic study of microbiologically influenced corrosion

Product Number: 51318-10586-SG
Author: Jialin Liu / Wenwen Dou / Ru Jia / Xiaogang Li / Sith Kumseranee / Suchada Punpruk / Tingyue Gu
Publication Date: 2018
$20.00

This study demonstrates that the mechanisms of microbiologically influenced corrosion (MIC) by Desulfovibrio vulgaris, a sulfate reducing bacterium (SRB), against X65 carbon steel and pure copper belong to two different types of MIC.
Categories
Industry
Recently viewed
Popular tags
View all

Association for Materials Protection and Performance

© AMPP All Rights Reserved.
Membership Terms of Content Use
Contact Customer Support