Ductile iron pipes: why do you want to spray zinc processing

by:XEX     2020-12-13
Pipe by spraying zinc processing mainly to enhance anti-corrosion performance, my company the production of ductile pipes all galvanized anti-corrosion treatment. Potential of iron is 0. 440 mv, and potential of zinc is 0. The low voltage of 763 mv, than iron, oxygen potential to 1. 4mV。 The zinc oxide the potential difference between the larger, more likely to form a galvanic cell, which will cast iron pipe wall are protected. In the process of contact with the soil environment, materials such as metal zinc carbonate in soil combined into insoluble zinc carbonate, this layer of protective film tightly bonding on the wall, form a layer of dense continuous, insoluble and leakage of the coating. Coating on the zinc layer of asphalt paint also has an important role, can promote the dissolution of zinc layer into a stable and zinc salts. In the process of pipeline transportation and installation, local damage may occur. Under the action of zinc in the galvanic cell quickly into zinc ions. Zinc ions migration of the role of sealing the pores through the asphalt layer and cover damage, forming stable and insoluble zinc layer protection. Experiments show that zinc spray 130 g / ㎡ of nodular cast iron tube life 100% higher than that of no zinc spraying pipe, spray zinc 200 g / ㎡ than galvanized pipe for improvement of the life of 165%. Zinc spray execution ISO8179 quality standard 130 g/m2, any point not less than 110 g/m2. By adjusting the car spraying zinc and wire feeding wheel walking speed and quality of zinc spray nozzle distance control.
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