Chromium-plated plate for bottle cap iron capable of being directly sprayed with ink and manufacturing method of chromium-plated plate

The invention relates to the technical field of steel rolling and surface treatment, and provides a chromium-plated plate for bottle cap iron capable of being directly sprayed with ink and a manufacturing method of the chromium-plated plate. The chromium-plated plate comprises a chromium oxide layer, a metal chromium layer and an iron substrate which are sequentially arranged from top to bottom; the surface roughness Ra of the iron substrate is 0.45-0.7 [mu] m, the average width Rsm of the contour unit is 50-80 [mu] m, and the maximum skewness Rsk of the contour unit is 0.1-0.4. According to the technical scheme, the problem that in the prior art, decoding cannot be carried out due to the fact that the code spraying quality grade is easily reduced by direct chromium-plated plate plain iron code spraying is solved. 本发明涉及钢压延及表面处理技术领域，提出了一种可直接油墨喷码的瓶盖铁用镀铬板及其制造方法，镀铬板包括由上至下依次设置的氧化铬层、金属铬层和铁基板；铁基板的表面粗糙度Ra为0.45~0.7μm，轮廓单元的平均宽度Rsm为50~80μm，轮廓单元的最大偏斜度Rsk为0.1~0.4。通过上述技术方案，解决了现有技术中直接镀铬板素铁喷码容易降低喷码质量等级导致无法译码的问题。