EIS of Q235 steel with epoxy coaltarcoating was determined. It is shown that the infiltrative electrolyte amount into coating decreases with increasing coating thickness.
采用环氧煤沥青作为涂层材料，测定了涂敷不同厚度涂层的Q 235钢的交流阻抗谱。
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Coaltarcoating has been used as the material for corrosion prevention for its good stable physical and chemical properties which has a large range of raw material resource and low price.
Coating material of epoxy coaltar has been prolonged in the fields of corrosion protection for long distance pipeline, metal storage tank and oil field facilities.