Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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The Corrosion Inhibition Characteristics of Sodium Nitrite Using an On-line Corrosion Rate Measurement System

온라인 부식속도 측정 시스템을 이용한 아질산 나트륨의 금속 부식억제 특성 연구

  • Park, Mal-Yong (Department of Mechatronics Engineering, Korea Polytechnic University) ;
  • Moon, Jeon-Soo (Future Technology Research Laboratory, KEPCO Research Institute) ;
  • Kang, Dae-Jin (Department of Mechatronics Engineering, Korea Polytechnic University)
  • 박말용 (한국산업기술대학교 메카트로닉스 공학과) ;
  • 문전수 (한전 전력연구원 미래기술연구소) ;
  • 강대진 (한국산업기술대학교 메카트로닉스 공학과)
  • Received : 2015.02.27
  • Accepted : 2015.04.29
  • Published : 2015.04.30
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Abstract

An on-line corrosion rate measurement system was developed using a personal computer, a data acquisition board and program, and a 2-electrode corrosion probe. Reliability of the developed system was confirmed with through comparison test. With this system, the effect of sodium nitrite ($NaNO_2$) as a corrosion inhibitor were studied on iron and aluminum brass that were immersed in sodium chloride (NaCl) solution. Corrosion rate was measured based on the linear polarization resistance method. The corrosion rates of aluminum brass and iron in 1% NaCl solutions were measured to be 0.290 mm per year (mmpy) and 0.2134 mmpy, respectively. With the addition of 200 ppm of $NO{_2}^-$, the corrosion rates decreased to 0.0470 mmpy and 0.0254 mmpy. The addition of $NO{_2}^-$ caused a decrease in corrosion rates of both aluminum brass and iron, yet the $NO{_2}^-$ acted as a more effective corrosion inhibitor for iron. than aluminum brass.

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References

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