Contact Corrosion of Bimetallic Couples of Aluminum or Anodized Aluminum and Mild Steel or Stainless Steel in Inorganic Corrosive Media

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  • アルミニウムおよび陽極化成アルミニウムと軟鋼およびステンレス鋼との組合せの接触腐食
  • アルミニウム オヨビ ヨウキョク カセイ アルミニウム ト ナンコウ オヨビ ステンレス コウ ト ノ クミアワセ ノ セッショク フショク

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Contact corrosion of couples of aluminum-mild steel, aluminum-stainless steel, anodized aluminummild steel, and anodized aluminum-stainless steel was studied. Corrosion current, weight loss, polarization measurement and salt spray test were carried out on these couples in various inorganic corrosive media: 1N NaCl, 0.1N NaCl, 1N CaCl2, 0.1N CaCl2, 1N Na2SO4, satd. Ca(OH)2 (pH=12.5), 0.38N Na2CO3, 0.5N Na2CO3, 0.1N NaCl, 0.069N NH4OH, 0.09N H2SO4, 0.1N HCl.<br>Under various experimental conditions, both aluminum and anodized aluminum were in general less noble than mild steel and stainless steel except in sodium sulfate and sulfuric acid solutions, in which mild steel was anodic against aluminum and anodized aluminum.<br>In most of the experimental conditions, aluminum and anodized aluminum sacrificially protected mild steel and stainless steel from corrosion completely. Weight loss of aluminum was, however, much greater than that of anodized aluminum. Corrosion current by the aluminum-mild steel and aluminum-stainless steel couples in alkaline solutions was about ten to one hundred times larger than in neutral solutions, while, in the case of anodized aluminum-mild steel and anodized aluminum-stainless steel couples, except in neutral and acidic solutions containing Cl ion, only a small corrosion current was measured.

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