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The Effect of the pH of Ammonum Nitrate Solution on the Susceptability of Mild Steel to Stress Corrosion Cracking (SCC) and General Corrosion
Department of Chemical Engineering, American University of Sharjah, Sharjah, United Arab Emirates
The Petroleum Institute, Abu Dhabi, United Arab Emirates
The Petroleum Institute, Abu Dhabi, United Arab Emirates
- 1 Department of Chemical Engineering, American University of Sharjah, Sharjah, United Arab Emirates
- 2 The Petroleum Institute, Abu Dhabi, United Arab Emirates
- 3 The Petroleum Institute, Abu Dhabi, United Arab Emirates
Materials Sciences and Applications·Volume 01 (2010)·Pages 191–198·Published 29 October 2010·DOI10.4236/msa.2010.14030
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Abstract
This work investigates the relative aggressiveness of nitrate solutions at different pH values on mild steel towards stress corrosion cracking (SCC) and general corrosion. Electrochemical behavior and stress corrosion cracking sus-ceptibility measurements were carried out in 52 Wt% ammonium nitrate solutions at 368° K and various pH values ranging from 0.77 to 9.64. Constant load stress corrosion test at 90% yield stress was conducted. Tested specimens were prepared and examined using the scanning electron microscope (SEM). The potentiodynamic polarization curves for different pH values again emphasized the validity of the gravimetric measurements and hence the mechanism of cracking was attributed to the stress that assisted the dissolution process.
KeywordsStress Corrosion CrackingAmmonium Nitrate SolutionMild SteelConstant Load TestEffect of PH
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