JP2006037217A - Corrosion prevention method for part near ground in iron product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for further improving the corrosion resistance of a part near the ground by efficiently employing the corrosion resistance of hot dip galvanizing, and to obtain an iron product whose part near the ground is prevented from corrosion by this method. <P>SOLUTION: In the corrosion prevention method, at first, the whole is subjected to hot dip galvanizing, next, sandblasting is applied to the required range in the part near the ground, and zinc is thickly applied thereto by thermal spraying. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention belongs to the surface treatment of iron products.

The guardrail struts are divided into a portion buried in the ground and a portion exposed on the ground, but the portion near the boundary (the ground) is particularly severely corroded. For this reason, the other parts are in a state where they can be used sufficiently, but it has been necessary to replace them.

A similar situation occurs in other than the guard rail columns, but this occurs because the columns only have a uniform surface treatment even though the corrosive environment is severe. In other words, there was no good way to protect the ground.

Making use of the corrosion resistance of hot dip galvanizing, and obtaining a method to further improve the corrosion resistance on the ground. Also, obtain iron products that prevent corrosion on the ground by that method.

First, the whole is hot dip galvanized, then sandblasted to the necessary area on the ground, and then thickened with zinc by thermal spraying.

According to the present invention, the corrosion resistance in the necessary range from the ground to the buried portion is increased, and the life of the building can be extended.

A steel pipe will be described as an example. After processing the steel pipe into the product dimensions, the whole is hot dip galvanized. By this. A zinc layer, an alloy layer of zinc and iron can be formed from the surface, a corrosion-resistant film that does not peel off can be formed, and there is sufficient corrosion resistance on the ground and on the ground.

Next, sandblasting is applied to the necessary area for corrosion resistance on the ground, creating a base that is easy to spray, and then spraying and thickening zinc. This operation often involves masking the areas that are not sprayed and spraying following sandblasting.

Moreover, since the buried portion is easily corroded, this treatment is often applied to the buried portion below the ground. Furthermore, when the steel pipe is short, only the ground part is hot dip galvanized, and this treatment may be performed from the ground to the buried part.

Claims (2)

An anti-corrosion method characterized by hot-dip galvanizing for iron products that are partially buried in the ground, then sandblasting to the necessary area on the ground, and then thickening the zinc by thermal spraying. An iron product characterized by hot galvanizing first, then sandblasting to the necessary area on the ground, and then thickening the zinc by thermal spraying.