The Effect of Thermal Treatments on Stress Corrosion Cracking of Alloy-800 in a Caustic Environment

CORROSION ◽  
1985 ◽  
Vol 41 (10) ◽  
pp. 575-581 ◽  
Author(s):  
R. S. Pathania ◽  
R. D. Cleland
Keyword(s):  
Stress Corrosion ◽  
Steam Generator ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
Caustic Solution ◽  
Thermal Treatments ◽  
Steam Generators ◽  
Alloy 800 ◽  
Steam Generator Tubing ◽  
Alkaline Environments

Abstract Stress corrosion cracking (SCC) tests under controlled potentials were conducted on plastically stressed C-rings of Alloy-800 to evaluate the effect of thermal treatments (at 500 to 850 C) on SCC of Alloy-800 steam generator tubing. The tests were conducted in a caustic solution at 300 C; such alkaline environments may sometimes form in crevices in nuclear steam generators. The results are presented in the form of a time-temperature-SCC diagram. Thermal treatments generally inhibited the SCC of Alloy-800, and the improvement was substantial in a few cases. Application of anodic potential and increasing stress generally accelerated SCC.

Stress Corrosion Cracking of Steam Generator Tube Materials in Sodium Hydroxide Solutions

CORROSION ◽  
1978 ◽  
Vol 34 (11) ◽  
pp. 369-378 ◽  
Author(s):  
R. S. PATHANIA ◽  
J. A. CHITTY
Keyword(s):  
Stress Corrosion ◽  
Sodium Hydroxide ◽  
Applied Stress ◽  
Steam Generator ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
Sodium Hydroxide Concentration ◽  
Inconel 600 ◽  
Steam Generator Tubing ◽  
Monel 400

Abstract Stress corrosion cracking (SCC) tests were carried out on specimens of Monel 400, Inconel 600, and Sanicro 30 steam generator tubing in solutions containing 10 to 500 g NaOH/kg H2O at 300 C for times up to 600 days. Applied stress and sodium hydroxide concentration had a significant effect on the (SCC) resistance of the three materials.

scholarly journals Laboratorial technique for fabrication of outer diameter stress corrosion cracking on steam generator tubing

2014 ◽  
Vol 13 (3) ◽  
pp. 112-119
Author(s):  
Jae-Min Lee ◽  
Sung-Woo Kim ◽  
Seong-Sik Hwang ◽  
Hong-Pyo Kim ◽  
Hong-Deok Kim
Keyword(s):  
Stress Corrosion ◽  
Steam Generator ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
Outer Diameter ◽  
Steam Generator Tubing

scholarly journals Electro chemical studies on stress corrosion cracking of Incoloy-800 in caustic solution, part I: As received samples

2005 ◽  
Vol 20 (1) ◽  
pp. 74-80 ◽  
Author(s):  
Alice Dinu ◽  
Manuela Fulger ◽  
Dragos Ionescu ◽  
Lucian Velciu ◽  
Maria Radulescu
Keyword(s):  
Stress Corrosion ◽  
Steam Generator ◽  
Stress Corrosion Cracking ◽  
Corrosion Current ◽  
Corrosion Cracking ◽  
Caustic Solution ◽  
Potentiodynamic Curves ◽  
Naoh Solution ◽  
Incoloy 800 ◽  
Chemical Studies

Many non-volatile impurities accidentally introduced into the steam generator tend to Concentrate on its surface in restricted flow areas. In this way these impurities can lead to stress corrosion cracking (SCC) on stressed tubes of the steam generator. Such impurities can be strong alkaline or acid solutions. To evaluate the effect of alkaline concentrated environments on SCC of steam generator tubes, the tests were con ducted on stressed samples of Incoloy-800 in 10% NaOH solution. To accelerate the SCC process, stressed specimens were anodically polarised in a caustic solution in an electro chemical cell. The method of stressing of Incoloy-800 tubes used in our experiments was the C-ring. Using the cathodic zone of the potentiodynamic curves it was possible to calculate the most important electrochemical parameters: the corrosion current, the corrosion rate, and the polarization resistance. We found that the value of the corrosion potential to initiate the SCC microcracks was -100 mV. The tested samples were examined using the metallographic method. The main experimental results showed that the in crease of the stress state promoted the in crease of the SCC susceptibility of Incoloy-800 samples tested under the same conditions, and that the length of the SCC-type microcracks in creased with the growth of the stress value.

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