フェライト塗膜の防食性能

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タイトル別名
  • Corrosion Protective Property of Ferrite Paint Films
  • フェライト トマク ノ ボウショク セイノウ

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The corrosion protective perperty and the effective pigment concentration of the paint of various mixture ratios prepared from ferrite pigments (MO·Fe2O3, M=Mg, Ca, Sr, Ba, Fe, Zn) and linseed oil were investigated by the various electrochemical measurements. From these results, the value of tan δ of Mg ferrite paint of 4:1 (a mixture ratio of linseed oil and ferrite pigment), and of Fe ferrite paints of 4:2 and 4:3 was about 0.5. Both the resistance of their paint film (Rp) and the charge transfer resistance (Rθ) were larger than 105Ω. Consequently, it was found that the good corrosion protective property of Mg ferrite paint is seen in low pigment concentration and of Fe ferrite paint is seen in high pigment concentration. From the impedance measurement of SS 41 steel in the extracted aqueous solution of the paints, the value of Rθ became large with the time. Therefore, it was supposed that the corrosion protective property of the extracted aqueous solution is ascribed to the passivation of the decomposition components of linseed oil and ferrite pigments.

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