Transmission line fastening piece alloy coating and preparation process thereof

Abstract

The invention relates to a transmission line fastening piece alloy coating and a preparation process thereof. The alloy coating is characterized by comprising the following components in percentage by weight: 0.045 to 3 percent of aluminum, 0.03 to 3 percent of magnesium, 0.03 to 3 percent of rare earth, 0.01 to 2 percent of copper and the balance of zinc. The preparation process comprises the following steps of: 1) washing a coating piece with an acid and water, namely performing acid washing on the coating piece for 5 to 30 minutes before a hot dip process by adopting 10 to 20 percent hydrochloric acid; and washing the coating piece with the water after the acid washing; 2) fluxing treatment, namely performing fluxing on the coating piece obtained from the step 1) in a fluxing agent for 20 to 120 seconds at the temperature of between 50 and 120 DGE C; and 3) performing the hot dip process. The alloy coating can effectively prolong the anti-corrosion lifetime of a hot dip coating of a fastening piece in a transmission tower in power industry, make the fastening piece of a stressed part of the transmission tower have prolonged anti-corrosion lifetime under complex corrosive environment conditions, ensure that the thickness of a coating is not increased, and simultaneously improve the anti-corrosion lifetime for over 3 times compared with hot-dip plated pure zinc in industry.

Description

[technical field] [0001] The invention relates to a hot-dip plating technology for metal materials of fasteners of transmission lines in the electric power industry, in particular to a hot-dip anti-corrosion coating applied to fasteners between connecting structural parts on transmission line poles and towers in the electric power industry. [Background technique] [0002] The loss caused by the corrosion damage of steel is huge. In the United States, it costs more than 30 billion U.S. dollars for corrosion damage and repair of steel every year. According to data, China’s annual loss of steel corrosion is about 500 billion yuan, accounting for 10% of the total national product. It can be seen that the corrosion of steel has caused a great waste of materials and energy, and hot-dip galvanizing can effectively improve the corrosion resistance of steel, thereby reducing the loss of steel due to corrosion by 20~ 30%. [0003] The fasteners connecting the stressed parts of the tr...

AI Technical Summary

Problems solved by technology

[0006] At present, alloy plating solutions and alloy coatings containing various alloy elements are used for hot-dip plating of transmission tower fasteners, and fasteners connected to power transmission tower stress components are hot-dipped with this alloy plating solution in complex corrosion environments. The obtained alloy coating has not been reported in the literature at home and abroad.