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An important application of song in the industrial field of derusting Huaigang pill !
Song has the advanced performance of Huaigang pill, which is economical, convenient and practical. Because the whole machine and parts of the construction machinery are heavy and the heat capacity is large, the drying method of the antirust coating is generally used to dry the uniform hot air convection. The heat source can be adapted to local conditions, such as steam, electricity, light diesel, natural gas and liquefied petroleum gas. Because of the wide range of engineering machinery, many specifications, heavy machine and large parts, it is generally applied to paint. The spraying tools include air spray gun, high pressure airless spray gun, air auxiliary spray gun and portable electrostatic spray gun. The air gun spray efficiency is low (around 30%). The high pressure airless spray gun wastes paint. The common feature of both is the serious environmental pollution, so it has been replaced by air assisted spray gun and portable electrostatic spray gun. The painting equipment used for engineering machinery generally adopts a more advanced spray paint room. Small and medium sized parts can also be used in water screen spray room or pump spray chamber.
1. Anti rust coating technology of engineering machinery
The anti rust coating process of engineering machinery can be divided into coating process, exterior treatment process and antirust, primer, primer coating process.
1: surface treatment of steel shot and steel grit
Appearance disposal is one of the most important processes for antirust coating. The quality of anticorrosive coating on engineering machinery depends largely on the manner of the exterior treatment. The coating life is restricted by 3 factors: the appearance disposal accounts for 60% coating construction accounting for 25% of the paint's own quality accounting for 15%, according to the British Imperial Chemical Company. The surface disposition of parts is different. Engineering machinery industry is different.
Increasing the bonding force between the antirust coating and the metal matrix, the mechanical cleaning can effectively remove the rust, slag, oxide skin and eliminate the welding stress on the workpiece. Thus the anti rust quality of the parts of the engineering machinery is greatly improved. The mechanical cleaning specification is required to reach ISO85011: 1988Sa2.5 level. 1/3 spray, blasting the surface roughness to achieve anti rust coating thickness for steel to meet the requirements of GB6484.
The appearance of sheet metal stamping is generally treated with chemical appearance. The process flow is as follows:
Artificial pretreatment, hot water washing, pre degreasing, degreasing, industrial water washing, industrial washing, two to surface adjustment, phosphating to industrial water washing, three to industrial water washing four to pure water washing, two to water washing and drying.
Or without pickling process, the above process can be adjusted according to the oil and rust conditions of the sheet metal stamping parts. Or no pre degreasing process. Which is the key process of chemical degreasing and phosphating process in steel, quality of the two processes directly affect the workpiece processing quality and chemical antirust coating. The process parameters and related auxiliary equipment are also an important factor affecting the quality of the external treatment.