Prevention of Chloride Stress Corrosion Cracking Under Insulation

2008 ◽  
pp. 165-165-13
Author(s):  
LC Sumbry ◽  
EJ Vegdahl
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
Chloride Stress Corrosion Cracking

Simultaneous Monitoring of Acoustic Emission and Corrosion Potential Fluctuation for Mechanistic Study of Chloride Stress Corrosion Cracking

2006 ◽  
Vol 321-323 ◽  
pp. 254-259 ◽  
Author(s):  
Akio Yonezu ◽  
Hideo Cho ◽  
Takeshi Ogawa ◽  
Mikio Takemoto
Keyword(s):  
Acoustic Emission ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Corrosion Potential ◽  
Corrosion Cracking ◽  
Type I ◽  
Type Ii ◽  
Potential Fluctuation ◽  
Frequency Components ◽  
Chloride Stress Corrosion Cracking

Both the acoustic emission (AE) and corrosion potential fluctuation were monitored for chloride stress corrosion cracking (SCC) of sensitized Type-304 stainless steel plate under bi-axial stress states. Branched SCCs were produced from rectangular-shaped corrosion pits initiated by falling-off of surface grains and filled with chromium oxide in 30mass% MgCl2 solution (363K). Both the AE and potential fluctuation were simultaneously detected during pit formation and SCC growth. Two types of AE (Type-I and Type-II) were monitored. Type-I AEs with higher frequency components were detected during the pit growth and supposed to be produced by falling-off of surface grains due to intergranular attack, while a number of Type-II AEs (approximately 12,500 counts) with low frequency components were detected during SCC propagation and supposed to be produced by cracking of the chromium oxy-hydroxides. Though the AEs detected during SCC test are not always the primary AEs from the SCC itself, secondary AEs can be usefully utilized to monitor the SCC initiation and propagation as well as the corrosion potential fluctuation.

Chloride Stress Corrosion Cracking of Austenitic Stainless Steel—Effect of Temperature and pH★

CORROSION ◽  
1958 ◽  
Vol 14 (12) ◽  
pp. 60-64 ◽  
Author(s):  
L. R. SCHARFSTEIN ◽  
W. F. BRINDLEY
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Stainless Steels ◽  
Chloride Ions ◽  
Corrosion Cracking ◽  
Effect Of Temperature ◽  
Type 304 ◽  
Chloride Stress Corrosion Cracking

Abstract Overstressed U-bends of Types 304 and 347 stainless steels were exposed to water containing chloride ions to determine the susceptibility of these steels to stress corrosion cracking between the temperatures of 165 F and 200 F. The pH was controlled at 6.5 to 7.5 and 10.6 to 11.2 for the tests. At the high pH, cracks appeared at the edges with little evidence of pitting. At the neutral pH, cracks were found at the edges and associated with pits. Sensitized Type 304 had longer and deeper cracks than annealed Types 304 and 347 in the same exposure time. Conclusion is made that chloride stress corrosion cracking of these steels in the temperature range of 165 F to 200 F is less severe than that experienced at 500 F and that specific conditions are required for corrosion cracking to occur at all. 3.2.2

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