電気防食用Al-Zn-In合金陽極の研究

• 坂野 武

  三菱金属鉱業 (株) 鉱業研究所

• 戸田 一夫

  三菱金属鉱業 (株) 鉱業研究所

書誌事項

タイトル別名

• Studies on Al-Zn-In Alloy Anode for Cathodic Protection
• デンキ ボウショクヨウ Al-Zn-In ゴウキン ヨウキョク ノ ケンキュウ

抄録

Al-Zn-In alloy is taken up as a galvanic anode and studied fundamentally elucidating the anodic behaviors in artificial sea-water in the laboratory. Experiments are continued for several hundred hours at ambient temperature while maintaining the anodic current density around 1.0mA/cm². Throughout the test anodic potentials are observed regularly and weight decreases of anodes are finally determined. Al-Zn alloy anodes are tested similarly for comparison. The results revealed are:<br>1) Superior performance characteristics can be obtained with Al-Zn-In anode containing 0.01-0.02% of In and 0.5-5% of Zn.<br>2) The anodic potential of the Al-Zn-In anodes is about -1.1V referred to SCE and shows little tendency of rise during the test. On the other hand, the Al-Zn anode gives the potential of -0.95V.<br>3) The anodic current efficiency of the Al-Zn-In anode exceeds 80% at the current density above 1mA/cm², whereas that of the Al-Zn anode is no more than 60%.<br>4) Small amount of Fe and Si contained in 99.85% grade aluminum is not only effective in improving the anode performance but it somewhat increases anodic current efficiency, while 0.01% of Cu gives rise to marked deterioration of the performance.<br>5) The Al-Zn anode shows appreciable pitting corrosion and slime formation which can scarcely be observed in case of the Al-Zn-In anode.<br>6) Some explanations of the corrosion process and the activation mechanism of the anodes are attempted from microscopical and electronmicroscopical observations.<br>Further, an actual marine test at a pier by which the superior performance characteristics of the Al-Zn-In alloy anode compared with that of the Al-Zn anode (Alcoa's Al anode composition) has been established is described. The former shows about four times as much of current output as the latter.

収録刊行物

• CORROSION ENGINEERING DIGEST

  CORROSION ENGINEERING DIGEST 11 (11), 486-492, 1962

  社団法人 腐食防食協会

キーワード

• General Engineering
• General Materials Science

詳細情報

• CRID: 1390282680407459968
• NII論文ID: 130006140857
• NII論文ID: 130004981003
• NII論文ID: 10003504755
• NII書誌ID: AN00261781
• DOI: 10.3323/jcorr1954.11.11_486
• ISSN: 18841155
• ISSN: 00109355
• NDL書誌ID: 9200937
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I9200937
• Web Site: https://www.jstage.jst.go.jp/article/jcorr1954/11/11/11_11_486/_pdf
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