Theoretical description of the practical possibility of stress corrosion cracking from crevice corrosion sites

✍ Scribed by S. Wang

• Publisher: John Wiley and Sons
• Year: 2005
• Tongue: German
• Weight: 97 KB
• Volume: 56
• Category: Article
• ISSN: 0947-5117
• DOI: 10.1002/maco.200403800

✦ Synopsis

Stress corrosion cracking (SCC) from crevice corrosion sites had been found in an experimental work at polarization potential of þ 200 mV SCE . In that work, an occluded U-bend specimen of Type 316L (UNS S31603) stainless steel was used. The testing was done in sodium chloride (NaCl) solution. Based on that work, the practical possibility of SCC from the occluded U-bend specimen was described theoretically. It was shown that it would also be possible for SCC to occur in practice (i.e. at practical corro-sion potential), but the crevice needs to be tighter. Meanwhile, it would take a longer time for obvious SCC to emerge. For a practical crevice usually formed by placing a crevice former on a large uniform metal surface, the crevice geometry may have little effect on SCC although the crevice can sustain an acidified solution more easily than pitting. The possibility of SCC should mainly depend on the corrosion system itself, i.e. material and environment.