High negative potential magnesium base alloy sacrificial anode material and application thereof

Abstract

The invention discloses a high negative potential magnesium base alloy sacrificial anode material and application thereof, and belongs to magnesium alloy materials for sacrificial anodes. The high negative potential magnesium base alloy sacrificial anode material is characterized in that: 100 weight parts of sacrificial anode material comprises the following metal element components in part by weight: 0.50 to 1.3 parts of Mn, 0.01 to 0.2 part of Ga, less than or equal to 0.01 part of Al, less than or equal to 0.01 part of Fe, less than or equal to 0.01 part of Cu, less than or equal to 0.001 part of Ni, less than or equal to 0.05 part of Si and the balance of Mg. The invention provides the high negative potential magnesium base alloy sacrificial anode material, which has enough negative and stable open circuit potential and closed circuit potential, high current efficiency and wide application range. The open circuit potential is -1.82 to -1.85V, the closed circuit potential is -1.75 to -1.76V, the current efficiency is over 55 percent and reaches 65 percent, and the actual electric capacity is more than 1,285A.h / kg. The sacrificial anode material is widely used for manufacturing anode protecting sacrificial anodes of metal pipes for supplying water, gas, natural gas and heat, ships, offshore drilling platforms, docks and harbors, crossing sea bridges, pipelines under the ocean, water heaters, steam boilers and heat exchanges in petrochemical industry and pharmacy.

Description

technical field [0001] The invention relates to a high negative potential magnesium-based alloy sacrificial anode material and its application, which belongs to the corrosion inhibition of metal materials, and particularly relates to a magnesium alloy material used for a sacrificial anode. Background technique [0002] The chemical corrosion of metal materials, especially iron and steel materials, not only causes a serious waste of resources, but also poses a threat to the environment on which human beings depend. Cathodic protection is implemented on metal components by sacrificial anodes to slow down the corrosion rate of metal materials. It is a metal corrosion inhibition method widely used in recent years. [0003] Metal magnesium has high chemical activity, low electrode potential and high driving voltage. Moreover, in the aqueous medium, the microscopic corrosion potential driving force on the surface of metal magnesium is large, the protective film is easy to dissol...

AI Technical Summary

Problems solved by technology

But the downside is that their current efficiency is low, only about 50%

[0005] 1. The open circuit potential and closed circuit potential are not negative enough,

[0006] 2. The current efficiency is low, it is difficult to exceed 55%, and it has not been reported that it is greater than 60%

[0007] 3. Narrow scope of application

Images