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    Home > Coatings News > Paints and Coatings Market > Discussion on anticorrosive phosphating process of iron, zinc and manganese series

    Discussion on anticorrosive phosphating process of iron, zinc and manganese series

    • Last Update: 2020-02-21
    • Source: Internet
    • Author: User
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    The early application of phosphating process is rust prevention Steel parts are phosphated to form a layer of phosphating film, which plays a role in rust prevention The antirust period of workpieces treated by phosphating and antirust treatment can reach several months or even years (for oiled workpieces) It is widely used for antirust in the process of process, transportation, packaging, storage and use There are mainly three kinds of antirust phosphating: iron phosphating, zinc phosphating and manganese phosphating The main bath composition of iron phosphating is ferrous phosphate solution, which does not contain oxidation accelerant and has high free acidity This kind of iron series phosphating treatment temperature is higher than 95 ℃, the treatment time is more than 30 minutes, the weight of phosphating film is more than 10 g / m2, and it has double functions of rust removal and phosphating This kind of high temperature iron phosphating is seldom used now because of its slow phosphating speed Manganese phosphating has the best performance as antirust phosphating, and the microstructure of phosphating film is particle dense, which is the most widely used antirust phosphating If nitrate or nitroguanidine accelerant is added, the speed of phosphating film can be accelerated Generally, the treatment temperature is 80-100 ℃, the treatment time is 10-20min, and the membrane weight is more than 7.5g/m2 Zinc series phosphating is also a widely used rust proof phosphating Nitrates are usually used as accelerators The treatment temperature is 80-90 ℃, the treatment time is 10-15 minutes, and the weight of the phosphating film is more than 7.5g/m2 The microstructure of the phosphating film is generally a close pile type General process flow of antirust phosphating: oil removal, rust removal, water cleaning, surface adjustment and activation, phosphating, water cleaning, chromate treatment, drying, greasing or dyeing treatment Workpieces treated with strong alkali and strong acid will lead to the coarsening of phosphating film The surface adjustment and activation can refine the grains Oxalic acid and colloidal titanium can be used for zinc phosphating Manganese phosphating can be activated by insoluble manganese phosphate suspension Iron phosphating generally does not need to adjust activation treatment After phosphating, the work piece can be sealed with chromate to improve the rust resistance greatly For example, after oiling or dyeing treatment, the rust resistance can be increased several or even dozens of times.
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