Method and apparatus for measuring degree of corrosion of metal materials,申请号US19930126768-传众专利搜索

Method and apparatus for measuring degree of corrosion of metal materials

申请公布号：US5519330(A)

申请号：US19930126768

申请日期：1993.09.27

申请公布日期：1996.05.21

申请人：

HITACHI, LTD.

发明人：YAMAUCHI, HIROSHI;SAKAI, MASANORI;MABUCHI, KATSUMI;TAKAHASHI, TAKUYA;OHNAKA, NORIYUKI;HATTORI, SHIGEO

分类号：G01N17/02;(IPC1-7):G01N27/06

主分类号：G01N17/02

摘要：A corrosion degree measuring method capable of field measurement for intergranular corrosion, particularly the sensitization degree, of the plant's structural materials in a narrow space. The metal electrode made of a material being measured and the counter electrode to the metal electrode are immersed in an electrolytic solution. A voltage is applied to the metal electrode in the anodic direction so as to raise the potential of the metal electrode up to the passive state potential and to keep the metal electrode at the passive state potential. The passive state potential is used as a reference potential, and a pulse-like potential signal is applied to the metal electrode in the cathodic direction. At the time of the application of the pulse potential signal, a current between the metal electrode and the counter electrode is measured, and the corrosion degree of the material being measured is determined from the intensity of the current.