JPS59199488A - Waste tank with anti-corrosion effect - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a waste tank for storing corrosive solutions.
In particular, the present invention relates to a corrosion prevention method in which the entire surface is lined with a resin that has an anticorrosion effect.

[Prior art]

Radioactivity at nuclear power plants? The radioactive waste from each building (hereinafter referred to as radioactive waste) is stored in waste storage tanks located within the facility. If corrosion occurs in this waste storage tank, will it affect the operation of the entire plant? In addition, the human body and the environment may be contaminated. Therefore, the redundant storage M tank YC needs to have high ml durability.
L1 The tank material is made of stainless steel, which has excellent corrosion resistance, or the inner surface of the carbon tank is lined with resin to prevent corrosion. However, even if the tank is made of stainless steel, if the waste liquid contains miscellaneous large factors, there is a risk of surface corrosion, pitting, stress corrosion cracking, etc. Manufacturing large tanks is also time-consuming due to cost considerations.

On the other hand, in the method of lining the inside of a carbon steel tank with resin, if local damage occurs due to resin bottle balls and deterioration, local corrosion occurs due to this damaged VC.

Therefore, there is a recent trend of applying cathodic protection methods to carbon steel tanks! 'C6ru. However, even with the cathodic protection method, it is difficult to operate under radiation environments (some waste tanks require inspection, repair, maintenance,
There are many problems with d theory.

C. Object of the Invention The object of the present invention is to provide a corrosion prevention method for preventing corrosion of a carbon steel tank in which radioactive waste is stored and maintaining the integrity of the tank over a long period of time. It is about providing.

[Summary of the invention]

The inventors of the present invention have conducted various studies on corrosion prevention methods to ensure that carbon steel tanks remain healthy over a long period of time. -f: As a result, we succeeded in imparting excellent light resistance to an iron tank by lining it with a resin containing VcL with a resistance of 1. That is, aluminum, red sea bream, iron such as zinc and its alloys, etc., which are commonly used as resistant anodes in conductive resin,
It has been found that using a base metal in an excessive amount as a lining agent for carbon steel tanks is an excellent long-term corrosion protection method for tanks. Resin? When applied to the surface of a carbon steel tank, if the liquid penetrates into the resin through pinholes in the resin, aluminum, magnesium, zinc, etc. are more electrochemically active than iron on the steel surface. is preferentially released into the anode over the iron surface, providing corrosion protection to the upper surface.

In addition, when aluminum, magnesium, zinc, etc. react with an aqueous solution, the amorphous hydroxide produced becomes basic and stabilizes the passivation effect on the steel surface.

[Actual MM example of invention]

Examples of the present invention will be described below, but the invention is not limited to these in any way.

Example I In non-examples, 40 to 44% zinc powder, 5 to 19% siloxane resin, and 1 part silicon dioxide fine powder are mixed in 1 sum of boso styrene resin melted in a solvent such as methyl ethyl ketone as an anticorrosive resin material for a carbon steel tank. ~3% r added? Created.

Next, a sample member, a small model tank (see Figures 1 and 2), was made from commercially available carbon steel (88-41) IK.
In Figure 2, the anticorrosive resin material 3 of the present invention was applied to the test VC.

Is there a test solution containing the related molecules listed in Table 1 for both sample parts? Corrosion status k n+'?
Beta. As a result, while the conventional tanks produced by one person had dotted red rust on the steel surface, the tanks coated with the anticorrosive resin of the present invention were completely healthy.

Table 1 Example ■ As an anticorrosive resin material, 40-44% aluminum powder, 5-19% siloxane resin, and 1-3% silicon dioxide fine powder are mixed in a polylambda ethylene polymer bath-melted in a solvent such as methyl ethyl ketone. What was added? Created. Is this an R4 food experiment by applying it to a small model tank as in Example I? I did it.

The effect was good, with no corrosion observed on the product coated with the anticorrosive resin R.

Example ■ As an anticorrosive resin material, 40~44% of L magnesium powder, 5~19% of siloxane resin, and 1~3% of silicon dioxide fine powder were added to a polystyrene polymer melted in a solvent such as methyl ether ketone. I made something. Apply VC to a small model tank in the same way as in Example 1.
I had one eating experience.

As a result, in the case where the anticorrosive resin was applied as in Example 2, rust was not observed at all from the pinholes and damaged parts of the resin.

[Invention V) Effect]

As is clear from the above explanation, it is clear that the present invention can be applied to a carbon copper tank made of anti-corrosion material, and a carbon steel tank for radioactive waste can be reliably protected from corrosion for a certain period of time. be done. Therefore, radioactive waste can be safely stored.

Furthermore, the tank prevention method is very simple because it can be done simply by applying the anticorrosive resin material to the carbon steel tank.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a small model tank in which a test member is lined with resin by the conventional method, and FIG. 2 is a cross-sectional view of a small model tank in which the test member is resin-lined by the method VC of the present invention. Figure 1: Aquarium 2 - Singing

Claims (1)

[Scope of Claims] 1. In a steel tank, the surface of the tank that comes into contact with the liquid is made of a resin r containing base metals with a voltage of more than 300 mV or more than the tank material.
A waste tank which has an anti-corrosion effect due to lining. 2. Said metal i1. A waste tank having an anticorrosive effect according to claim 1, characterized in that the waste tank is made of Mg, Zn, and Az. 3. A waste tank having an anti-corrosion effect as claimed in claim 1, wherein the resin is conductive.