白ぶどう酒中におけるアルミニウムの腐食 Corrosion of Aluminum in White Wine

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The rate of uniform corrosion, the likelihood of pitting and crevice corrosion for aluminum, Al, in white wine were investigated in this paper. In commercial wines, the K<sub>2</sub>S<sub>2</sub>O<sub>5</sub> is commonly added to induce free-SO<sub>2</sub> which reduces the dissolved oxygen and acts as a fungicide in the wine. The spontaneous electrode potential of Al, <i>E</i><sub>SP</sub>, in a deaerated wine containing less than 1ppm of free-SO<sub>2</sub>, at 25°C was measured to be about -600mV vs. SCE. Since the K<sub>2</sub>S<sub>2</sub>O<sub>5</sub> is an oxidizing agent for the Al, the <i>E</i><sub>SP</sub> was ennobled with the addition of K<sub>2</sub>S<sub>2</sub>O<sub>5</sub> reaching -520mV with a concentration of 1000ppm K<sub>2</sub>S<sub>2</sub>O<sub>5</sub>. The uniform corrosion rate was measured to be 13μm/y at 25°C and this rate was found to depend on the temperature with an activation energy of 42kJ/mol. However, this rate was found to have no dependency on the electrode potential within the <i>E</i><sub>SP</sub> range. The critical pitting potential, <i>V</i><sub>C, PIT</sub>, measured in the wine containing 25ppm of Cl<sup>-</sup> was -370mV which was more noble than the <i>E</i><sub>SP</sub>, and the pitting corrosion can not occur. The repassivation potential for the growing crevice corrosion, <i>E</i><sub>R, CREV</sub>, was measured to be -530mV. It was also found that this potential does not depend on either the temperature or the concentration of K<sub>2</sub>S<sub>2</sub>O<sub>5</sub>. It was observed that the <i>E</i><sub>SP</sub> became more noble than the <i>E</i><sub>R, CREV</sub> with the addition of 800ppm K<sup>2</sup>S<sup>2</sup>O<sup>5</sup> at 25°C. At a lower temperature, however, the <i>E</i><sup>SP</sup> became more noble than the <i>E</i><sup>R, CREV</sup> when a lesser amount of K<sub>2</sub>S<sub>2</sub>O<sub>5</sub> were added. An effective method to decrease the rate of uniform corrosion is to reduce the holding temperature; however, to effectively prevent the crevice corrosion at these lower temperatures, the K<sub>2</sub>S<sub>2</sub>O<sub>5</sub> concentration must be kept below 100ppm.

収録刊行物

  • 材料と環境 : zairyo-to-kankyo  

    材料と環境 : zairyo-to-kankyo 45(5), 305-314, 1996-05-15 

    Japan Society of Corrosion Engineering

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各種コード

  • NII論文ID(NAID)
    10002262878
  • NII書誌ID(NCID)
    AN10235427
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    09170480
  • NDL 記事登録ID
    3960041
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-266
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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