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51316-7166-Corrosion of Nickel Alloys for Steam Generator Tubing of Pressurized Water Reactors

Picture for Corrosion of Nickel Alloys for Steam Generator Tubing of Pressurized Water Reactors
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Fe-Cr-Ni alloys such as alloys 600 625 690 and 800 are used in steam generator tubing of nuclear power reactors. Precipitation of impurities on the steam generator tubing can lead to fouling and formation of deposits yielding a partially occluded metal surface.  In this work the crevice corrosion susceptibility of these alloys is analyzed. 

Product Number: 51316-7166-SG
ISBN: 7166 2016 CP
Author: Martin Rodriguez
Publication Date: 2016
Industries: Energy Generation , Materials Selection and Design
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Fe-Cr-Ni alloys such as alloys 600 625 690 and 800 are used in steam generator tubing of nuclear power reactors due to their high mechanical strength and corrosion resistance at high temperature. Under operating conditions precipitation of impurities on the steam generator tubing can lead to fouling and formation of deposits yielding a partially occluded metal surface. In this work the crevice corrosion susceptibility of these alloys is analyzed. Crevice corrosion was studied in 1 M 0.1 M and 0.01 M NaCl solutions at 30 °C 60 °C and 90 °C and atmospheric pressure using artificially creviced specimens. Alloy specimens were polarized potentiodynamically up to 300 µA and held at that current for 2 hours; then the potential scan was reversed until reaching the alloy repassivation.All the alloys except alloy 625 suffered crevice corrosion. Test reproducibility was higher under more aggressive conditions (i.e. higher temperature and chloride concentration). The repassivation potential decreased with increasing temperature and chloride concentration indicating higher crevice corrosion susceptibility.Electrochemical impedance techniques were used to estimate corrosion rates and to characterize the passive oxide layer through the Mott-Schottky analysis. Tested alloys showed an n- to p-type transition with increasing potentia

 

Keywords: downloadable, UNS N06690, UNS N06600, UNS N08800, temperature, chloride, localized corrosion

 

Fe-Cr-Ni alloys such as alloys 600 625 690 and 800 are used in steam generator tubing of nuclear power reactors due to their high mechanical strength and corrosion resistance at high temperature. Under operating conditions precipitation of impurities on the steam generator tubing can lead to fouling and formation of deposits yielding a partially occluded metal surface. In this work the crevice corrosion susceptibility of these alloys is analyzed. Crevice corrosion was studied in 1 M 0.1 M and 0.01 M NaCl solutions at 30 °C 60 °C and 90 °C and atmospheric pressure using artificially creviced specimens. Alloy specimens were polarized potentiodynamically up to 300 µA and held at that current for 2 hours; then the potential scan was reversed until reaching the alloy repassivation.All the alloys except alloy 625 suffered crevice corrosion. Test reproducibility was higher under more aggressive conditions (i.e. higher temperature and chloride concentration). The repassivation potential decreased with increasing temperature and chloride concentration indicating higher crevice corrosion susceptibility.Electrochemical impedance techniques were used to estimate corrosion rates and to characterize the passive oxide layer through the Mott-Schottky analysis. Tested alloys showed an n- to p-type transition with increasing potentia

 

Keywords: downloadable, UNS N06690, UNS N06600, UNS N08800, temperature, chloride, localized corrosion

 

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51316-7170-Effect of Temperature on the Crevice Corrosion Resistance of Austenitic Stainless Steels

Product Number: 51316-7170-SG
ISBN: 7170 2016 CP
Author: Martin Rodriguez
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Resistance of S30400 and S31600 SSs to chloride-induced crevice corrosion was assessed in a wide range of temperatures and chloride concentrations. Repassivation potential of S30400 SS decreased with increasing chloride & temperatures from 0 to 60ºC, and it a constant value in the range from 60 to 90ºC regardless of chloride.

 
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Product Number: 51316-7157-SG
ISBN: 7157 2016 CP
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This paper will detail the environmental cracking test program and results when Alloy UNS S42028 (For applications such as high collapse liners sections in high pressure high temperature (HPHT) reservoirs) was exposed to medium density bromide based clear brine fluids at a temperature of 150oC (302oF).  
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51316-7135-The pitting corrosion of titanium in aggressive environments

Product Number: 51316-7135-SG
ISBN: 7135 2016 CP
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This study presents an overview of a number of factors influencing the pitting corrosion of Ti in aggressive environments. Effects of temperature and metal cations on pitting corrosion of Ti. 
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