Evaluation for Surface Cleanness of Metals Washed by the Electrolyzed Acid Water

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  • 酸性電解水による金属表面の洗浄
  • サンセイ デンカイスイ ニ ヨル キンゾク ヒョウメン ノ センジョウ

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Electrolyzed acid water obtained by the electrolysis of a dilute NaCl solution in the anode compartment shows low pH (acidity) and high ORP (Oxidation Reduction Potential), and it acts as an acid solution. By utilizing the electrolyzed acid water, metal and lead frames with oil were washed and cleaned, and then the cleanness of metal and lead frames for electronic products was evaluated. The surface analysis and quantitative data on the remaining residual oils and ionic contamination, AES (Auger Electron Spectroscopy) analysis on metals, and wire-bond pull strength of the lead frames which were washed and cleaned by the electrolyzed acid water, showed a higher level of cleanness compared to the that of the conventional cleaning method. The efficiency of degreasing and cleaning by electrolyzed acid water is supposed to be due to its high dissolved oxygen concentration and an operation of dissolving metal oxides and oils.<br>

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