A Study on the Corrosion of Al-Alloy Propeller Used for a Coasting Vessel

연안 선박용 Al합금 프로펠러의 부식에 관한 연구

  • Received : 2003.09.03
  • Accepted : 2003.11.20
  • Published : 2003.12.31

Abstract

Recently, with the tendency of lightening, high-strength and high-speed in the marine industries such as marine structures, ships and propellers, it is rapidly enlarged the use of the aluminium alloy. Therefore, there occurs much interest in the study on corrosion characteristics of aluminium alloy. This paper was studied on the corrosion characteristics of Al-Mg alloy propeller used for a coasting vessel. Under the various pH of marine environment, the corrosion test of Al-Mg alloy was carried out. And thus polarization resistance, corrosion potential, and current density behavior of Al-Mg alloy and galvanic corrosion behavior of Al-brass and Al-Mg alloy coupled Al 5086 and SS 400 for hull were investigated. The main results are as following: 1. The corrosion potential of Al-brass propeller is more nobel than materials for hull, but that of Al-Mg alloy propeller is low or similar to materials for hull. Therefore, the galvanic corrosion of hull due to Al-Mg propeller don't occur. 2. The polarization resistance of Al-Mg alloy in sea water of pH 4 is highest, and corrosion current density of Al-Mg propeller is the most controlled. 3. As pH value decreases, potential showed Evans polarization diagram approaches cathodic potential. The corrosion current density of Al-Mg alloy is controlled to anodic reaction rate, therefore, the corrosion reaction of Al-Mg alloy is anodic control.

References

  1. 전대희, 실용방식공학, 태화출판사, pp.150-154, 1989
  2. 이상승, 현대중공업(주)의 업체동정, 한국박용기관학회지, Vol. 27, No. 2, pp.1-2, 2003
  3. 김영식, 최신 기계재료학, 형설출판사, pp.288-291, 1993
  4. 임우조.양학희.인현만.이진열, 부식과방식, 원창출판사, pp. 301-303, 1994
  5. 이학열, 금속부식공학, 연경문화사, pp.263-264, 1990
  6. 山田盛雄, アルミニム技術便覽', 日本輕合金出 判株式會社, pp.1675-1701, 1995
  7. 隈元 士, 船用プロペラと軸系, 日本成山堂書店, pp.35-38, 1991
  8. 尹藤伍郞, 機械工學全書 6(腐食と防食), 日本コロナ社, pp.87-89, 1982
  9. Denny A. Johes, Principles and prevention of corrosion, Macmillan publishing company, pp.168-169, 1991
  10. 中川 雅央, 電氣防食法の實際, 日本地人書館, pp.248-249, 1987
  11. 靑木 健, プロペラと軸系裝置, 日本海文堂, pp.55-57, 1989
  12. K. R Trechewey.J. Chamberlain, Corrosion for Science and Engineering, Longman Scientific & Technical, 2nd edition, pp.135-137, 1995
  13. J. R. Davis, Corrosion of Aluminum and Aluminum Alloys, ASM International, pp.1-10, 1999
  14. 前田泰昭.竹中規, 地球規での酸性雨現狀と材 料劣化, 日本材料と環境, Vol.40, No. 9, pp.619-629, 1995
  15. 尹藤伍郞, 機械工學全書 6(腐食と防食), 日本コ ロナ社, pp.272-273, 1982