光沢剤を含むアルカリジンケート浴から電析したZn-Ni合金皮膜の耐食性

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タイトル別名
  • Corrosion Resistance of Zn-Ni Alloy Films Electroplated from Alkaline Zincate Solution Containing Brightener
  • コウタクザイ オ フクム アルカリジンケートヨク カラ デンセキシタ Zn-Ni ゴウキン ヒマク ノ タイショクセイ

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<p>Zn–Ni alloys were electroplated on an Fe plate with thicknesses of 40 μm at 500 A·m−2 and 293 K in unagitated zincate solutions. The reaction product of epichlorohydrin and imidazole (IME) was added in the solution as a brightener at the concentration of 0-5 ml/dm−3. The corrosion resistance of the obtained Zn–Ni alloys films was investigated from the polarization curve in 3 mass% NaCl solution before and after the corrosion treatment (formation of corrosion products) in NaCl solution for 48 h. Before the corrosion treatment, the corrosion current density of plated films rarely changed regardless of addition of IME into the zincate solution because the reduction reaction of dissolved oxygen rarely changed. However, in films plated from the solution containing IME, the anode reaction was suppressed and the corrosion potential shifted to noble direction. The suppression of anode reaction with an addition of IME in plating solution is attributed to the increase in γ-phase in plated films. On the other hand, after the corrosion treatment, the morphology of Zn chloride hydroxide of corrosion product was uniformly formed on the surface with increasing the concentration of IME. The reduction reaction of dissolved oxygen was suppressed with increasing the concentration of IME, resulting in decrease in corrosion current density.</p>

収録刊行物

  • 鉄と鋼

    鉄と鋼 109 (4), 289-300, 2023

    一般社団法人 日本鉄鋼協会

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