| 摘要 |
PURPOSE:To improve the corrosion resistance of the title steel in an H2S environment by successively plating Cu and Ni on the steel surface in specified thicknesses, and then coating a synthetic resin thereon. CONSTITUTION:Cu is plated in 5-30mum thickness on the steel surface to form a first layer, and a small amt. of H2S infiltrating through the pinhole of the layer on the first layer is combined with Cu to form stable CuS. Ni is further plated in 5-50mum thickness on the Cu plated layer. Since the Ni layer as the second layer hardly rusts, the adhesive strength to the synthetic resin to be coated thereon is maintained. A synthetic resin layer having high chemical resistance is further coated in 10-1,000mum thickness on the Ni layer as a third layer.
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