Role of Oxygen in Localized Corrosion and Stress Corrosion Cracking of Carbon Steel in Fuel Grade Ethanol

2019 ◽  
Vol 33 (14) ◽  
pp. 21-31
Author(s):  
Feng Gui ◽  
Narasi Sridhar ◽  
John Beavers
Keyword(s):  
Carbon Steel ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
Localized Corrosion ◽  
Fuel Grade Ethanol

Effect of pearlite on stress corrosion cracking of carbon steel in fuel-grade ethanol

2018 ◽  
Vol 36 (3) ◽  
pp. 281-293
Author(s):  
Janne Torkkeli ◽  
Tapio Saukkonen ◽  
Hannu Hänninen
Keyword(s):  
Carbon Steel ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Pure Iron ◽  
Cathodic Polarization ◽  
Selective Dissolution ◽  
Corrosion Cracking ◽  
Localized Corrosion ◽  
Cementite Phase ◽  
Fuel Grade Ethanol

AbstractThe selective dissolution of ferrite phase from the pearlite was studied in fuel-grade ethanol (FGE) to understand how it affects the stress corrosion cracking (SCC) mechanism of carbon steel in FGE. It was shown that microgalvanic coupling occurs between ferrite and cementite phases of the pearlite, leading to localized corrosion, which affects the SCC mechanism. The intergranular SCC mechanism stops at the pearlite, and the selective dissolution promotes the transgranular SCC mechanism. Cathodic polarization curves were measured for pure iron and cementite exposed to various FGE conditions. According to the results, cementite phase is, in most cases, a more favorable cathode in FGE.

Stress Corrosion Cracking and Localized Corrosion of Carbon Steel in Nitrate Solutions

CORROSION ◽  
10.5006/2035 ◽  
2016 ◽  
Vol 72 (7) ◽  
pp. 927-942 ◽  
Author(s):  
N. Sridhar ◽  
J.A. Beavers ◽  
B. Rollins ◽  
S. Chawla ◽  
K. Evans ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
Localized Corrosion ◽  
Nitrate Solutions

Effects of Environmental and Metallurgical Factors on the Stress Corrosion Cracking of Carbon Steel in Fuel-Grade Ethanol

CORROSION ◽  
2011 ◽  
Vol 67 (2) ◽  
pp. 025005-1-025005-15 ◽  
Author(s):  
J.A. Beavers ◽  
F. Gui ◽  
N. Sridhar
Keyword(s):  
Carbon Steel ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Environmental Variables ◽  
Ethanol Concentration ◽  
Compact Tension ◽  
Steel Grade ◽  
Corrosion Cracking ◽  
Oxygen Scavenging ◽  
Fuel Grade Ethanol

Abstract This paper presents the results of a research program to study the effects of metallurgical variables, ethanol-gasoline blends, dissolved oxygen, and inhibitors on the stress corrosion cracking (SCC) of carbon steel in ethanol. The study utilized both slow strain rate (SSR) and fatigue precracked compact tension (CT) tests to characterize the effect of metallurgical and environmental variables on SCC. Metallurgical factors, including steel grade within a range of pipeline grades, welds, and heat-affected zone, do not appear to have a significant effect on the degree or rate of SCC. In terms of environmental factors, it is shown that SCC does not occur even in a fully aerated condition if the ethanol-gasoline blends contain less than approximately 15 vol% ethanol; SCC susceptibility and crack growth rate are higher in 50 vol% ethanol gasoline blend (E-50) than in either lower or higher ethanol concentration blends; oxygen scavenging can be an effective method to prevent SCC; water content above 4.5 wt% prevents SCC in ethanol; and fatigue precracked CT tests show similar trends in SCC susceptibility as SSR tests.

Effect of Ethanol Chemistry on SCC of Carbon Steel: Results of a Round Robin Testing

2010 ◽  
Author(s):  
Narasi Sridhar ◽  
Feng Gui ◽  
Elizabeth Trillo ◽  
Preet M. Singh
Keyword(s):  
Carbon Steel ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Round Robin ◽  
Corrosion Cracking ◽  
Test Results ◽  
Test Procedures ◽  
Minor Constituents ◽  
Fuel Grade Ethanol

The stress corrosion cracking (SCC) susceptibility of carbon steel in fuel grade ethanol varies as a function of major and minor constituents in ethanol. The results of a round-robin testing on six different ethanol batches are presented. Significant variations in test results between the laboratories may result from apparently minor differences in test procedures. The variation in SCC susceptibility of different ethanol chemistries appear to be small.

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