Zinc alloy sacrificial anode material for reinforced concrete structure in chlorine salt erosion environment

Abstract

The invention belongs to a sacrificial anode protection material of a reinforced concrete structure, in particular, a zinc alloy sacrificial anode material for a reinforced concrete structure in a chlorine salt erosion environment. In order to solve problems in a sacrificial anode material in the prior art, the following technical schemes of the invention are adopted, the sacrificial anode material of the invention comprises the following components in percentage by mass: 0.5% of Al; 0.1% of Cd; 0.18%-0.36% of La; 0.42%-0.84% of Ce; 0 to 0.1% of impurities; and the balance of Zn. The zinc alloy sacrificial anode material provided by the invention has the advantages of good activation performance, uniform corrosion, good corrosion resistance and long service life, and meets the use requirements of reinforced concrete. The zinc alloy sacrificial anode material is excellent in electrochemical performance, and the current efficiency reaches about 95%. The surface corrosion product of the zinc alloy sacrificial anode material is likely to shed.

Description

technical field [0001] The invention relates to a sacrificial anode protection material for a reinforced concrete structure, in particular to a zinc alloy sacrificial anode material for a reinforced concrete structure under a chloride corrosion environment. Background technique [0002] Cathodic protection of steel bars in concrete is a well-recognized method of providing corrosion protection for metals, especially in the presence of high concentrations of chloride ions in concrete, while the sacrificial anode materials currently used in concrete environments are mainly aluminum alloys, magnesium alloy, zinc alloy, etc. Compared with the harsher service conditions of the first two anode materials, zinc alloy anode has become the main sacrificial anode material due to its higher current efficiency and self-regulating characteristics. However, the harmful impurity elements in the zinc alloy anode have a great impact on the corrosion dissolution and performance of the anode ma...

AI Technical Summary

Problems solved by technology

However, the harmful impurity elements in the zinc alloy anode have a great impact on the corrosion dissolution and performance of the anode material, which in turn affects the effectiveness of steel corrosion protection in the chloride corrosion environment.

In the face of this situation, there are two kinds of zinc anode materials currently used, one is to use high-purity zinc anode (Zn>99.995%, Fe<0.0014%, Cu<0.002%, Pb<0.003%), which requires improving the process The other is to improve the performance of the anode by adding conventional trace element alloying methods, but the improvement effect is limited. In the special environment of concrete, Zn-Al-Cd alloy anode is provided in the national standard. Due to the existence of intergranular Corrosion problems, resulting in uneven corrosion and reduced protection

Images