A steel strip having excellent workability and corrosion resistance that requires no oil coating, and a manufacturing method therefor. The steel strip comprises a substrate and a phosphatization layer and a stearate lubricant layer provided on the substrate. The upper surface of the steel strip sequentially comprises, from inside to outside, the phosphatization layer and the stearate lubricant layer, with a surface roughness R.sub.a in the range of 0.6 to 1.8 m and R.sub.z in the range of 6 to 16 m, providing good surface lubricity during extension process. The lower surface of the steel strip has the stearate lubricant layer with a surface roughness R.sub.a of 0.3 m or less and R.sub.z of 2 m or less, offering good lubricity and high surface cleanliness. By using the steel strip designed with differentiated functionality on two surfaces according to the present invention can be directly stamped to process high-precision and large-deformation shell parts, eliminating the traditional processes of coating, oiling, and cleaning after forming required for manufacturing the high-precision and large-deformation shell parts from conventional steel plates, significantly improving the efficiency of parts manufacturing. Additionally, the steel strip has good rust resistance and corrosion resistance, and the surfaces thereof require no oil-coating treatment during storage and transportation.

The invention relates to a coating agent for coating acid-sensitive metal surfaces, which is an aqueous solution of an acidic phosphate binder, the coating agent comprising a peroxo compound and being free of chromium (VI) salts. The invention further relates to a method of coating a metal surface with such a coating agent, and to the use of such a coating agent for increasing the corrosion resistance of metal components in various industrial fields.

The invention relates to a coating agent for coating acid-sensitive metal surfaces, which is an aqueous solution of an acidic phosphate binder, the coating agent comprising a peroxo compound and being free of chromium (VI) salts. The invention further relates to a method of coating a metal surface with such a coating agent, and to the use of such a coating agent for increasing the corrosion resistance of metal components in various industrial fields.