Evaluation of Electrical Resistivity of Oxide Scale Formed under Different Conditions

Ali, Md. Rostom; Saka, Masumi; Tohmyoh, Hironori; Akanda, Md. Abdus Salam

doi:10.1299/jmmp.4.1732

Cited by 2 publications

(3 citation statements)

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“…Ali et al discussed that the potential drop changes during the DCPD measurement is due to creep of the oxide film caused by Joule heat at the contact point (Ali, et al, 2010(Ali, et al, , 2012. In this study, the same tendencies of potential changes could be obtained in stainless steel, but they were not as clear as those Ali et al obtained from carbon steel (Ali, et al, 2010(Ali, et al, , 2012.…”

Section: Discussionsupporting

confidence: 66%

“…The DCPD measurement system of Ali et al (Ali, et al, 2010(Ali, et al, , 2012 was used to measure the oxide film of the carbon steel. Figure 1 schematically shows the layout of the measurement system.…”

Section: A Direct Current Potential Drop Measurementmentioning

confidence: 99%

“…If the thickness of the oxide film can be detected quantitatively and in-situ, one may be able to evaluate the possibility of SCC initiation and take preventive maintenance measures. Ali et al previously tried to measure the oxide film thickness of carbon steel formed in an atmosphere between room temperature to 292ºC (565K) using a four-point-probe direct current potential drop (DCPD) method (Ali, et al, 2010(Ali, et al, , 2012. They showed that the measured potential difference decreased in a constant current condition during acquisition time and finally the current became closer to the value of the non-oxide film condition.…”

Section: Introductionmentioning

confidence: 99%

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A direct current potential drop method for evaluating oxide film thickness formed in high-temperature water

Anzai

Ishibashi

Saka

2016

Mechanical Engineering Letters

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A direct current potential drop method for evaluating oxide film thickness formed in high-temperature water Abstract To establish an evaluation technique for oxide film thickness in-situ, the applicability of a four-point-probe direct current potential drop method is discussed in this study. Several samples of JIS SUS316L stainless steel with different oxide film thickness were prepared after immersing them in oxygenated pure water at 288ºC for different periods. The oxide film thickness was measured by cross sectional observation using a transmission electron microscope. Potential drop on the oxide surface was measured every second during an acquisition period of about 20 s while a constant current was being injected into the sample simultaneously. This kind of measurement was repeatedly carried out at several arbitrary contact positions on the surface of the same sample. The measurement results showed that the potential drop slightly changed during the acquisition period and the tendency varied at the different contact positions. Multiple measurements at different contact positions revealed that the tendency could be categorized into two general types: the decreasing potential drop and the increasing potential drop, defined by the overall trend of the potential drop during the acquisition time. It was found that the ratio of contact positions with a decreasing potential drop tendency to all the contact positions of measurement tended to increase as applied current increased. This tendency depended on the oxide film thickness. The threshold value of applied current was found to correlate well with the oxide film thickness when the occurrence rate of decreasing potential drop ranged from 70 to 90% showing the best correlation at 70%.

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