Fastener hot-dip galvanizing production technology

Abstract

A fastener hot-dip galvanizing production technology comprises the steps of chemical degreasing: applying degreasing agents and ultrasonic wave to a fastener jointly in a degreasing tank which is provided with an ultrasonic generator, wherein the degreasing temperature is 20-40 DEG C, and the degreasing time is 1 min; washing for first time; washing for second time; acid pickling; washing for third time; dipping in assistant plating solvents; drying and preheating: drying and preheating the fastener, and the drying temperature is 80-100 DEG C; galvanizing for first time: immersing the fastenerin a large galvanizing pot, and the galvanizing temperature is 440-460 DEG C; drying of a channel: preheating a transfer channel between the large galvanizing pot and a small galvanizing pot by fluegas waste heat of the large galvanizing pot; galvanizing for second time: immersing the fastener in the small galvanizing pot, and the galvanizing temperature is 500-540 DEG C; centrifugation; cooling; and passivation. Compared with a simple design galvanizing method, the technology has the advantages that the galvanizing capacity is improved obviously, and the investment cost and the operation cost are reduced obviously; the production efficiency is high, and the galvanizing effect is good; and the zinc consumption and energy consumption of the technology are both lower.

Description

technical field [0001] The invention relates to the technical field of fastener processing, in particular to a production process of hot-dip galvanizing for fasteners. Background technique [0002] In the prior art, in order to improve corrosion resistance and brightness, fasteners are generally treated by hot-dip galvanizing process, and the fasteners are immersed in molten zinc liquid to obtain a metal coating. In recent years, with the rapid development of high-voltage power transmission, transportation, and communication, there are increasingly higher requirements for fastener protection. At the same time, the demand for hot-dip galvanized parts is also increasing. In the existing hot-dip galvanizing process, not only galvanized Zinc consumption is high, and energy consumption is also large, thus resulting in the current situation of high production costs. In addition, the current hot-dip galvanizing process has slow galvanizing efficiency and unsatisfactory galvanizing...

AI Technical Summary

Problems solved by technology

In recent years, with the rapid development of high-voltage power transmission, transportation, and communication, there are increasingly higher requirements for fastener protection. At the same time, the demand for hot-dip galvanized parts is also increasing. In the existing hot-dip galvanizing process, not only galvanized The zinc consumption is high, and the energy consumption is also large, resulting in the current situation of high production costs

In addition, the current hot-dip galvanizing process has slow galvanizing efficiency and unsatisfactory galvanizing effect, which can no longer meet the needs of production

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