MSA  Vol.1 No.4 , October 2010
The Effect of the pH of Ammonum Nitrate Solution on the Susceptability of Mild Steel to Stress Corrosion Cracking (SCC) and General Corrosion
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.

Cite this paper
nullF. Mohammed, A. Elramady and S. Yahya, "The Effect of the pH of Ammonum Nitrate Solution on the Susceptability of Mild Steel to Stress Corrosion Cracking (SCC) and General Corrosion," Materials Sciences and Applications, Vol. 1 No. 4, 2010, pp. 191-198. doi: 10.4236/msa.2010.14030.
References
[1]   ASM International, “Metals Handbook (Desk Edition),” Chapter 32 (Failure Analysis), American Society for Metals, 1997.

[2]   C. Sean Brossia, et al., “A Study of Stress Corro-sion Cracking and Localized Corrosion of Carbon Steel in Ni-trate Based Nuclear Waste,” NACE Conference, Georgia, 2009.

[3]   R. N. Parkins and R. Usher, “The Effect of Nitrate Solution in Producing Stress Corrosion Cracking in Mild Steel,” Proceeding of the First International Congress on Metallic Corrosion, London, 1961, p. 289.

[4]   R. N. Parkins, “Environmental Aspect of Stress Corrosion Cracking in Low Strength Ferrite Steels,” Proceeding of the International Con-ference on Stress Corrosion Cracking and Hydrogen Embrit-tlement of Iron Base Alloys, Firming, 1973.

[5]   Y. Z. Wang, R. W. Revie and M. T. Shahatas, “Early Stages of Stress Corrosion Cracks Development of X65 Pipeline Steel in Near Neutral pH Solution,” Materials for Resource Recovery and Transport, L. Collins, Ed., The Metallurgical Society of CIM, Montreal, 1998, p. 71.

[6]   R. W. Stachle, “Framework for Predicting Stress Corrosion Cracking,” Proceedings of Environmentally Assisted Cracking; Predictive Methods for Risk Assessment and Evaluation of Materials, Equipments and Structure, Orlando, 2000.

[7]   K. D. Boomer, J. beavers, et al., “A Study of Corrosion and Stress Corrosion Cracking of Carbon Steel Nuclear Waste Storage tanks,” Material Science and Technology Conference and Exhibition, Michigan, 2007.

[8]   F. Gui, C. S. Brossia, et al., “On the Anodic Polarization Behavior of Carbon Steel in Hanford Nuclear Wastes,” Corrosion 2007, NACE, Houston, 2007.

[9]   C. S. Brossia, C. Scott, et al., “Inhibition of Stress Corrosion Cracking of Carbon Steel Storage Tanks at Hanford,” Corrosion 2007, NACE, Houston, 2007.

[10]   Narasi Sridhar, et al., “Proceeding of Environmentally Assisted Cracking Predictive Methods for Risk Assessment and Evaluation of Materials, Equipments and Stracture”,Orlando,STP 1401,241(2000).

[11]   R. G. J. Leferink and W. M. M. Huijbregts, “Nitrate Stress Corrosion Cracking in Waste heat Recovery Boilers,” Anti – Corrosion Methods and Materials, Vol. 49, No. 2, 2002, pp. 118-126.

[12]   R. N. parkins, et al., “Stress Corrosion Test Method,” British Corrosion Journal, Vol. 7, 1972, p. 154.

[13]   F. S. Mohammed, “Stages of Corrosion Cracking of Mild Steel in Nitrate Solution,” Third International Material Conference, College of Engineering, Australia, 2008.

[14]   Corrosion Source, Last Revised December 2005. http:// www.corrosionsource.com/handbook/testing/scc.htm.

 
 
Top