The coastal area of Republic of Korea is very clean compared to other countries. In this reason, west coastal area of our country is a good place for breeding up a fish such as shrimp. In winter season, the heating system is required for preventing shrimp death caused by freezing in the farm. The he...
The coastal area of Republic of Korea is very clean compared to other countries. In this reason, west coastal area of our country is a good place for breeding up a fish such as shrimp. In winter season, the heating system is required for preventing shrimp death caused by freezing in the farm. The heater in the heating system for fishery's farm is operated very severe combating corrosion due to high accumulation by feeding material and high temperature in heated sea water. Almost all manufactured heaters of STS 316L and Ti material are scrapped every year due to heavy corrosion such a general and crevice corrosion. For comparing the general and galvanic corrosion in new heater material, the test material of Zirconium (Zr), Titanium (Ti) and STS 316L are tested by potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), current density-time methods and microscopic examination in a 3.5% NaCl solution. The corrosion potential (Ecor) measured by potentiodynamic polarization for Zr, Ti and STS 316L reveals -198, -250 and -450mV, corrosion current density 0.5, 2.5 and $6.5{\mu}A/cm^2$ respectively. The film resistance measured by EIS are Zr 63,000, Ti 39,700 and 316L $3,150{\Omega}$, and the current of Zr-Ti couple is $0.03{\mu}A$, whereas Zr-316L SS is $0.1{\mu}A$. According to the result of this experiment in 3.5% NaCl solution, Zr is excellent corrosion resistance material than Ti and STS 316L.
The coastal area of Republic of Korea is very clean compared to other countries. In this reason, west coastal area of our country is a good place for breeding up a fish such as shrimp. In winter season, the heating system is required for preventing shrimp death caused by freezing in the farm. The heater in the heating system for fishery's farm is operated very severe combating corrosion due to high accumulation by feeding material and high temperature in heated sea water. Almost all manufactured heaters of STS 316L and Ti material are scrapped every year due to heavy corrosion such a general and crevice corrosion. For comparing the general and galvanic corrosion in new heater material, the test material of Zirconium (Zr), Titanium (Ti) and STS 316L are tested by potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), current density-time methods and microscopic examination in a 3.5% NaCl solution. The corrosion potential (Ecor) measured by potentiodynamic polarization for Zr, Ti and STS 316L reveals -198, -250 and -450mV, corrosion current density 0.5, 2.5 and $6.5{\mu}A/cm^2$ respectively. The film resistance measured by EIS are Zr 63,000, Ti 39,700 and 316L $3,150{\Omega}$, and the current of Zr-Ti couple is $0.03{\mu}A$, whereas Zr-316L SS is $0.1{\mu}A$. According to the result of this experiment in 3.5% NaCl solution, Zr is excellent corrosion resistance material than Ti and STS 316L.
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문제 정의
5% NaCl solution. The results of this paper will promote the design for heater and concerned industries.
대상 데이터
Materials for experiment are Zr, Ti and STS 316L, and were purchased at material market in Korea. Chemical composition for Zr is Hf 0.
성능/효과
3) The measured current obtained by current vs time curve (IT) at 5hours immersion are Zr-Ti couple is 0.03㎂ whereas Zr-STS 316L is 0.1㎂. The Zr acted as cathode in both Ti and STS 316L couple.
Due to the fact of film resistance is directly connected with corrosion, the higher value indicates the good corrosion resistance. The EIS test results appeared that the Zr have very superior corrosion resistance than that of Ti and STS 316L.
5% NaCl solution. The result of this experiment confirmed that Zr is excellent corrosion resistance material than Ti and STS 316L. The results of this paper as follows;
참고문헌 (6)
Baik, Shin-Young(2004), A Study on the Crevice Corrosion for Ferritic Stainless Steel/Journal of the Korean Society of Marine Environment & Safety, vol. 10, no. 1 pp. 51-54.
Chen, Yingzi, Mirna Urquidi and Digby D. Macdonald(2006), The Electrochemistry of Zirconium in Aqueous Solutions at Elevated Temperatures and Pressures/Jr. of Nuclear Materials, 349, pp. 133-147.
Mogoda, A. S.(1999), Electrochemical Behavior of Zirconium and the Anodic Oxide Film in Aqueous Solutions Containing Chloride Ions/ The Solid Films, 357, pp. 202-207.
Mondal, K., B. S. Murty and U. K. Chatterjee(2005), Electrochemical behavior of amorphous and Nano quasi crystalline Zr-Pd and Zr-Pt Alloys/Corrosion Sciences, 47, pp. 2619-2635.
Vermoyal, J., A. Frichet, L. essemond and A. Hammou(1999), AC Impedance Study of Corrosion Films formed on Zirconium Based Alloys/Electrochemics Acta 45, pp. 1039-1048.
Yoo, R., Y. I. Son, G. T. Shim, Y. H. Kwon and Y. S. Kim(2009), Influences of Graphite Epoxy Composite on the Electrochemical Galvanic Corrosion of Metal/Corrosion Science and Technology, vol. 8, no. 1 pp. 27-39.
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