高張力鋼中の水素含有量の電気化学的測定法の改良

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  • Some Improvements in Electrochemical Technique for Measurement of Hydrogen Content in Hight Strength Steel
  • コウチョウリョク コウチュウ ノ スイソ ガンユウリョウ ノ デンキ カガクテ

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We already developed the nickel plating method. In order to anodize plated nickel to NiOOH, it needs more than 10 hours to reach less than 0.1μA/cm of residual current which is thought to be passive current of plated nickel. Such longer time of potentiostatic technique is due to the intense passivation by higher anodic current at early stage which disturbs furthermore passivation of the interior of plated nickel. The two steps method, i. e., the galvanostatic of 10μA/cm followed by the potentiostatic of 0V vs SCE, was found to shorten the passivation period up to 30 minutes and also to improve the detection sensitivity of hydrogen by one order compared with the previous method. In the fracture experiment to be submitted later, hydrogen content in steel to be measured is needed almost not to be affected by the flow rate of electrolyte and variation in cathodic current density. Such requirements were filled by the selection of 10mA/cm in a boric acidpotassium chloride solution.

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