The Relationship between potential and the water chemistry inside a crevice of stainless steel in high temperature water

高温水中におけるステンレス鋼すき間な内部溶液と電位の関係

相馬 康孝   ; 小松 篤史 ; 加藤 千明   

Soma, Yasutaka; Komatsu, Atsushi; Kato, Chiaki

クラック内部に代表されるすき間構造の内部環境を知ることは高温水中におけるステンレス鋼の応力腐食割れのメカニズム解明に重要である。これまでにもすき間内環境の分析例および優れたレビューが発表されているが、すき間内環境をその場測定した例は少ない。そこで本研究ではすき間内環境としてすき間内溶液導電率()を高温水中でin-situ測定し、重要な環境変数である電位(ECP)を変化させ、-ECPの関係を調べた。

Electrochemical environment within a crevice which is referred to as crevice (or crack) water chemistry is an important factor for understanding stress corrosion cracking (SCC) of stainless steels in high temperature water. There have been many studies and well-organized reviews on the crevice water chemistry. However, the measurement of the real-time behavior of crevice water chemistry as a function of potential (electrochemical potential, ECP) remains a major challenge. In this study, the in situ measurement of the electrical conductivity of the solution inside crevices, was carried out to analyzed -ECP relationship.