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Nippon Corrosion Engineering Co. | Date: 1987-01-06

GALVANIC ANODE FOR CORROSION PROTECTION.


Yamamoto S.,Nippon Corrosion Engineering Co. | Tashiro K.,Nippon Corrosion Engineering Co. | Hosoda Y.,Hosoda Building Contractors Co. | Ishii K.,Mitsubishi Group | Seki H.,Waseda University
2nd International Conference on Sustainable Construction Materials and Technologies | Year: 2010

The criterion of 100 mV depolarization is adopted in many cases of CP (cathodic protection) under atmospheric conditions. However, this criterion is not suitable for members under high moisture conditions. In this paper, another criterion, - 850 mV (less noble than -850 mV vs. Saturated Copper Sulphate Electrode (CSE)), was examined for specimens. The results show that under the 100 mV depolarization criterion, corrosion can not be sufficiently controlled when the CP currents are interrupted in order to avoid hydrogen evolving, but that the -850 mV criterion is more applicable under high moisture conditions. Source


Yoneya N.,Tokyo Institute of Technology | Amaya K.,Tokyo Institute of Technology | Akira Y.,Toyo Construction Co. | Tashiro K.,Nippon Corrosion Engineering Co. | And 2 more authors.
Zairyo to Kankyo/ Corrosion Engineering | Year: 2013

A new method for estimating the current of sacrificial anodes and the surface potential of the structure from the potential measurement was developed. The observation equation is formed by finite element method considering the geometry of the sea structure. Since this estimation problem is ill conditioned, the Bayesian Estimation approach is employed to overcome the problem. In order to demonstrate the effectiveness and efficiency of the present method, the verification experiment was performed at the real steel structures. This method enables us to estimate the corrosion protection state of the marine steel structure with easy inspection. Source


Yoneya N.,Tokyo Institute of Technology | Akira Y.,Toyo Construction Co. | Tashiro K.,Nippon Corrosion Engineering Co. | Iida T.,Nippon Corrosion Engineering Co. | And 2 more authors.
Zairyo to Kankyo/ Corrosion Engineering | Year: 2014

A new method for forecasting the current of sacrificial anodes using data assimilation was developed. In our system, In the framework of data assimilation, the system model forecasts the future state by the technical knowledge gained from experiments. The observation model corrects the forecasted result by the measurement information. In order to demonstrate the effectiveness and efficiency of our system, the verification experiment was performed at the real marine steel structures. The proposed method is expected to be a new approach for corrosion protection maintenance. Source

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