| 摘要 |
PURPOSE:To make it possible to measure metal material in high-temperature fluid by bringing the metal material into contact with electrolyte, sweeping the potential outputted from the metal in the forward direction and in the reverse direction at the different speeds, and measuring the polarization curves. CONSTITUTION:Electrolyte 6 of a polarization probe 2 is directly brought into contact with a metal material sample 1. The potential outputted from the sample 1 is swept in the forward direction and in the reverse direction from the natural potential to a passive-state region with a scanner 9. The loaded potential is measured with a coulomb meter 10. At this time, the sweeping is performed at the constant speed in the forward direction at first so that fine deposit is completely dissolved with the electrolyte 6. Then, the sweeping is performed in the reverse direction at the relatively slower speed than the forward sweeping speed, and the polarization current based on dissolution reaction of the large deposit is measured. Then, the polarization current, which is changing in correspondence with the loaded potential, is recorded in a recorder 12 through a logarithm converter 11. Since the large and small deposition parts are swept two times in the detection of the aging deterioration of the metal material, the measuring accuracy is improved. |
