A phosphate-treated steel plate comprises a zinc-base plated steel plate; a zinc phosphate coating layer formed on the surface of the zinc-base plated steel plate; and an organic or inorganic coating formed on the zinc phosphate coating layer. The organic coating comprises at least one organic resin selected from the group consisting of an ethylene-base resin, an epoxy-base resin, a urethane-base resin, and an acrylic-base resin. The inorganic coating comprises a phosphate coating consisting mainly of a phosphate.

Una placa de acero tratada con fosfato abarca una placa de acero plateada cinc-base; una capa de capa del fosfato del cinc formó en la superficie de la placa de acero plateada cinc-base; y una capa orgánica o inorgánica formó en la capa de capa del fosfato del cinc. La capa orgánica abarca por lo menos una resina orgánica seleccionada del grupo que consiste en una resina de la etileno-base, una resina de la de epoxy-base, una resina de la urethane-base, y una resina de la de acri'lico-base. La capa inorgánica abarca consistir de capa del fosfato principalmente de un fosfato.

 
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