Corrosion resistant nano coating, corrosion resistant steel and preparation method thereof

Abstract

The present invention belongs to the field of iron and steel surface treating technology, and is especially one kind of nanometer anticorrosive paint, its preparation process and steel rail coated with the paint. The nanometer inorganic paint consists of filming material 20-60 wt%, nanometer pigment 3-8 wt%, antirust assistant 5-15 wt%, other assistants 0.025-4 wt%, and deionized water 30-70 wt%. The nanometer inorganic paint has excellent painting performance, high mechanical strength, high anticorrosive performance, high weather resistance, capacity of forming thin smooth coating with certain conducting performance, and other advantages.

Description

Technical field [0001] The invention belongs to the field of surface treatment of iron and steel, and specifically relates to a corrosion-resistant nano coating, a steel rail prepared by coating the coating, and a preparation method thereof. Background technique [0002] With the application of high-strength steel rails, rail corrosion has become one of the most important factors affecting the service life of steel rails. [0003] At present, there is no formed, fully industrialized technology for improving the corrosion resistance of steel rails. Only some technical discussions and attempts have been made, including: [0004] (1) Using sacrificial protection method to improve the corrosion resistance of steel rails; [0005] (2) Alloy elements such as copper and chromium are added to the rail material steel to improve the corrosion resistance of the rail; [0006] (3) The surface of the steel rail is thermally sprayed with aluminum-zinc alloy coating to improve the corrosion res...

AI Technical Summary

Problems solved by technology

[0008] 1. The implementation of the sacrificial protection method is limited by the line. In addition, the current of the sacrificial protection circuit affects the railway signal, and the cost of replacing the consumable sacrificial zinc sheet is high, so it cannot be popularized and applied

[0009] 2. Adding copper, chromium and other alloying elements to the raw steel of the rail can improve the corrosion resistance of the rail, but the cost of the raw steel is high, and the technology of smelting and rolling of the rail steel needs to be greatly improved. The addition of chromium has side effects on the toughness and welding performance of high-carbon rail steel, which reduces the safety of rail use, so it has not been popularized

Thermal spraying requires 8 main processes including sand blasting and rust removal, dust removal, thermal spraying, cooling, organic coating spraying, drying, organic coating spraying, and drying. The process is long and cumbersome

[0014] In addition, "A production process for corrosion-resistant coated steel rail" (Chinese application date: May 26, 2003, patent number ZL 03117936.3) uses spraying coatings such as zinc-rich, zinc-rich aluminum, and aluminum-zinc rich. The process is long, the floor area is large, and the sprayed paint cannot be recycled and certain pollutants are formed, which brings about the problem of high processing costs

Zinc-rich, zinc-rich aluminum, aluminum-zinc and other coatings have good moisture resistance and salt spray resistance. However, since zinc, zinc-aluminum, and aluminum-zinc are amphoteric metals, they can react with both acid and alkali. Under aggressive conditions, the 75 micron coating has a short retention time