Higher requirements are put forward for the material, functionality, anti-corrosion and even decoration of the various parts that make up the mechanical equipment.The comprehensive performance of coupling rough parts and finished parts puts forward higher requirements, especially the continuous progress and improvement of iron parts in the process of surface treatment and rust prevention, from the original spray paint and alkaline blackening liquid to the present Blackening process at room temperature.Due to the need for protection, the original method of painting on castings is no longer popular. The paint will cover up cracks, pores, and paint drop on the castings.

　　The alkaline blackening liquid used has low efficiency and high energy consumption, especially when dealing with cast iron, it is easy to appear khaki, and the appearance often fails to meet the customer's satisfaction. It is blackened at room temperature.Coupling castings due to the particularity of the manufacturing process, the surface of the casting is easy to rust, and it is difficult to handle after rust. If it is not paid attention to, not only the anti-corrosion ability of the workpiece is poor, but the decoration is not good. While putting forward higher requirements for corrosion resistance, according to the different working conditions of the castings, it is required that the castings (cast iron, cast steel) be subjected to room temperature blackening, phosphating treatment and other special anti-rust treatments.

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