Magnesium alloy protective coating and preparation method thereof

Abstract

The invention provides a magnesium alloy protective coating. The magnesium alloy protective coating comprises a magnesium base material, a metal bonding layer, a transition metal layer and a functional layer, all of which are sequentially stacked; and the functional layer is of a single-layer film structure or a multi-layer film structure, the single-layer film structure is a single-layer hard layer or a single-layer soft layer, the multi-layer film structure is formed by stacking multiple single-group sub-films, and each single-group sub-film is formed by stacking a single-layer hard sub-layer and a single-layer soft sub-layer. According to the long-acting, stable, corrosion-resistant and wear-resistant surface protective coating, the problem of magnesium alloy building formboard engineering practice is solved, and according to the relation between the microstructure of the protective coating and corrosion resistance and wear resistance of the coating, the invention further provides a preparation method of the long-acting, stable, corrosion-resistant and wear-resistant protective coating for the surface of a magnesium alloy building formboard.

Description

technical field [0001] The invention relates to the technical field of building templates, in particular to a magnesium alloy protective coating and a preparation method thereof. Background technique [0002] The building formwork consists of a panel and a support system. The panel is the part that makes the concrete shape; the support system is the structural part that stabilizes the position of the panel and bears the load. The quality of building formwork is related to the quality of concrete engineering. The key to the quality of building formwork lies in the aspects of accurate size, reliable assembly, tight joints, and convenient disassembly and assembly. [0003] Magnesium alloy building formwork is a new type of construction equipment. Compared with traditional wood formwork, steel formwork and plastic formwork, it has many advantages: light weight, convenient construction, high efficiency; high strength, good stability, high bearing capacity; demoulding Good perfor...

AI Technical Summary

Problems solved by technology

However, magnesium alloy is also one of the most active metals in structural materials, and its standard electrode potential is relatively negative (-2.372V). Although magnesium alloy reacts with air at room temperature to form a natural oxide film, the film is loose and porous ( Density coefficient a=0.79<1), it does not have much protective effect on the magnesium alloy substrate, and it will cause serious corrosion in the application environment of building formwork and lose its usability

The solid solution strengthening and aging strengthening effects of magnesium alloys are not obvious, resulting in low hardness and poor wear performance

Therefore, sandstone erosion and wear of concrete slurry are another major problem that limits the wide application of magnesium alloys in the field of building formwork.

Images