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Galvanic Corrosion of Zn/Steel Couple in Aqueous MgCl₂
( E. Tada ),( S. Katakami ),( A. Nishikata ) 한국부식방식학회(구 한국부식학회) 2017 Corrosion Science and Technology Vol.16 No.4
Galvanic corrosion tests of Zn/steel couples were conducted in 1 M NaCl and 1 M MgCl₂ solutions to investigate the impact of magnesium ion on corrosion behavior of the couples. Two types of Zn/steel couples were used for measurements of open circuit potential (OCP) and galvanic current. From the results of OCP transient of Zn/steel couples, the corrosion potential in 1 M MgCl₂ was a more positive value than that in 1 M NaCl during the sacrificial dissolution of Zn. However, earlier increase of OCP of the couples in 1 M MgCl₂ solution indicates that the sacrificial dissolution rate of Zn in 1 M MgCl₂ was enhanced more than that in 1 M NaCl, agreeing with the results on transients of galvanic current. This result is due to that cathodic reaction on the steel surface of the Zn/steel couple was enhanced in 1 M MgCl₂ by the occurrence of hydrogen evolution reaction.
Studies on a Wind Turbine Generator System using a Shaft Generator System
F. Tatsuta,T. Tsuji,N. Emi,S. Nishikata 대한전기학회 2006 Journal of Electrical Engineering & Technology Vol.1 No.2
- In this paper a new dc-link type wind turbine generator system using a shaft generatorproposed wind turbine generating system is first explained. And the equations expressing the system are derived. Then the steady-state characteristics of the generating system are discussed. We use an experimental system that can simulate the characteristics of a wind turbine in this study, because it is hard to operate an actual wind turbine in a laboratory. In addition, the transient responses of this system are investigated when the velocity of the wind is changed. It is shown that experimental results were very close to the simulated ones, suporting the usefulness of theory.