Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Development of a Blended Corrosion, Scale and Micro-Organism Inhibitor for Open Recirculating Cooling System

  • Choi, Dong-Jin (Department of Metallurgical Engineering, Sungkyunkwan University) ;
  • You, Seung-Jae (Department of Metallurgical Engineering, Sungkyunkwan University) ;
  • Kim, Jung-Gu (Department of Metallurgical Engineering, Sungkyunkwan University) ;
  • Hwang, Woo-Suk (School of Materials Science and Engineering, Inha University)
  • Published : 2005.06.01
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Abstract

This paper presents the results of a study that was undertaken to optimize the ratio of the components of a new multi-component inhibitor blend composed of orthophosphate/ phosphonates/ acrylate copolymer/ isothiazolone. The effects of newly developed inhibitor on carbon steel dissolution in synthetic cooling water were studied through weight loss tests, electrochemical tests, scale tests, and micro-organism tests. The obtained results were compared to blank (uninhibited specimen) and showed that developed inhibitor revealed very good corrosion, scale, and micro-organism inhibition simultaneously. All measurements indicated that the efficiency of the blended mixture exceeded 90 %. The inhibitive effects arose from formation of protective films which might contain calcium phosphate, calcium phosphonate, and iron oxide. The nature of protective films formed on the carbon steel was studied by scanning electron microscopy (SEM) and auger electron spe ctroscopy (AES). Inhibitor used in this study appeared to have better performance for scale inhibition due to their superior crystal modification effect and excellent calcium carbonate scale inhibition properties. The effect of inhibitor on microorganisms was evaluated through minimum inhibitory concentration (MIC) test. All kinds of micro-organisms used in this study were inhibited under 78ppm concentration of inhibitor.

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