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Investigation of the Crevice Corrosion Resistance of UNS S31266 and UNS N06625 Using Accelerated Laboratory Test Methods

The crevice corrosion resistance of UNS S31266 and UNS N06625 was investigated by determining their critical crevice corrosion temperatures (CCT-values) in different solutions. The crevice formers described for tubes in ISO 18070 were used. Creviced samples were tested according to ASTM G150 and ASTM G48.For the electrochemical method ASTM G150 both 1M NaCl as specified in the standard and a modified test using 3M MgCl2 were used as test-solutions. The ASTM G48-test was performed using an acidified ferric chloride solution and a testing time of 72 hours. In both the electrochemical test and in the G48-test a torque momentum of 0.28 Nm for the crevice former was compared with a torque momentum of 1.58 Nm.It was found that the CCT-values of UNS S31266 were typically higher than for UNS N06625 in all tests. Additionally the CCT-value for UNS N06625 consistently decreased when the smaller crevice gap was used. This further increased the difference in CCT-values for the two alloys to the benefit of UNS S31266 for which CCT-values were similar at 0.28 and 1.58 Nm. The difference between the alloys is compared with published results and theories.Key words: Crevice Corrosion Crevice Gap Tube UNS S31266 UNS N06625 NaCl MgCl2 Acidity Chloride Concentration

Product Number: 51319-13077-SG
Author: Anna Delblanc
Publication Date: 2019
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$20.00
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