JPS6119786A - Vaporizable rust inhibitor of zinc - Google Patents

Abstract

PURPOSE:To provide a vaporizable rust inhibitor developing rust inhibiting effect even to a non-ferrous metal such as copper or zinc or an alloy thereof other than iron and an iron alloy, obtained by mixing cyclohexylammonium carbonate and benzotriazole or tolyltriazole in a predetermined ratio. CONSTITUTION:A vaporizable rust inhibitor is prepared by mixing 99-80pts.wt. of cyclohexylammonium carbonate (CHC) and 1-20pts.wt. of benzotriazole (BTA) or tolyltriazole (TTA). This rust inhibitor is different from such a case that each of CHC, BTA and TTA is used alone as a rust inhibitor and develops rust inhibiting effect not only to iron or an iron alloy but also to a non-ferrous metal such as copper, a copper alloy, zinc, zinc plating or Al. Therefore, an assembled product comprising different metals such as iron and copper can be inhibited from rust without disassembling the same.

Description

Detailed Description of the Invention Conventionally, nitrite amine salts such as dicyclohexylammonium nitrite (DOHHAN) or carboxylic acid amines such as cyclohexylammonium carbonate (CHC) have been used as volatile rust inhibitors for iron and iron alloys. Although salts are used, they not only have almost no rust-preventing effect on non-ferrous metals such as copper and zinc, but they also have the disadvantage of accelerating corrosion. In addition, triazoles such as benzotriazole (BTA) and tolyltriazole (TTA) are used as volatile rust preventive agents for copper and copper alloys, but they have the disadvantage that they have almost no rust preventive effect on other metals. be. Therefore, conventionally, when rust-preventing a combination of steel parts and other non-ferrous metal parts, the steel parts and other non-ferrous metal parts are separated, and each of the separated steel parts and, for example, a copper part, has its own dedicated Rust prevention is carried out using the above-mentioned rust inhibitors, but the rust prevention treatment is troublesome, and if there are zinc or zinc alloy parts, it not only has no rust prevention effect, but also iron or iron alloy parts. If the product is a combination of parts that cannot be separated, there is an inconvenience that corrosion cannot be avoided.

The present invention provides a volatile rust preventive agent that has a rust preventive effect on iron and iron alloys as well as copper and copper alloys, zinc and other nonmetals, and their alloys. ~80 pairs benzotriazole (BTA) or tolyltriazole (TTA
) are mixed at a ratio in the range of 1 to 20.

The rust prevention method of the present invention includes (1) a method of directly spraying the above-mentioned mixed powder as a predetermined ratio onto the material to be rust-prevented; (2) a method in which the above-mentioned two types of material to be mixed are mixed in a sealed container with the material to be rust-prevented; (3) A method of storing powders in separate bags or the same bag, vaporizing both, and bringing the mixture into contact with the rust-preventing material; Dissolve the seed powder
A common method is to dissolve it in an agent and apply or spray the solution onto the rust preventive material.

FIG. 1 shows an example of an apparatus for comparatively testing the effects of the rust preventive agent of the present invention.
2), and hang 5 plate test pieces of the same shape and size for each of iron, copper, zinc, and galvanized materials on the underside of the lid (2) as shown in the figure. In the center, each of the rust inhibitors A1 to 21 shown in Table 1,
s g f: Wrapped in non-woven fabric (3) Suspended as shown in the figure, heated the water (4) placed in the bottom of the container (1) and maintained at a temperature of 50°C ± α5゛C1 humidity 100%. After being left for 20 days, each test piece was taken out and the presence or absence of rust and the state of the rust were observed and observed.

The results are shown in Table IVC. In the table, ○ indicates no abnormality, △ indicates rust, × indicates a high degree of rust, and XX indicates a very high degree of rust.

The rust preventive agent is 0)10. TTASBTA alone, sample 15, 16, 170Ho and TTA or BTA at different blending ratios (weight ratio)'t - Sample &1
~14, Sample Todoroki with a combination of OHO and mercaptobenzothiazole 18, Sample A19 with a combination of OHO and diaminobenzimidazole, Diisopropylammoninitrite 1) A (DIPAN) alone 'Fj combination #A20゜D
IPAN and 'fTA combination sample & 21f usage sample.

Blank A22 shows the case where no rust preventive agent is used.

As is clear from the above table, the compounded rust preventive agent A1 of the present invention
It was found that only A10, that is, a mixture of 01099 to 80 and TTA or BTA in a weight ratio of 1 to 20, had a rust-preventing effect on any of iron, steel, galvanized, and aluminum. Other steels, copper alloys, zinc,
Similar tests were conducted on zinc plating and aluminum, and results similar to those shown in Table 1 were obtained.

Next, a vapor phase reach test was conducted on the rust preventive agent of the present invention using the test apparatus shown in FIG. 2. That is, the openings at both ends of the STB steel pipe e are covered with polyethylene characters 7't5J.
[5), the cap (distance between the opposing surfaces of 51f51 is 1 ft2 m), and the rust preventive agent (3) α5g to be tested is fixed to one end of the cap, and in this state, it is left outdoors for 30 days. The rust preventive effect on the inner surface of the steel pipe e was measured. As a sample of the rust preventive agent, the rust preventive agent &3 of the present invention was tested in comparison with dicyclohexyl ammonium nitrite (D-AHhH).

The results were as shown in Table 2 below.

Table 2 As is clear from Table 2 above, it is recognized that the rust preventive of the present invention has a wide range of vaporization rust preventive properties. Further, the amount of volatilization of the rust preventive agent of the present invention, such as Sample Black 3, was measured over time while it was left open indoors at room temperature. The result is the third
As shown in the vaporization characteristic curve A in the figure, the comparatively tested DIj
Compared to the rust inhibitor containing OHAM and D-PAN (its characteristic curve B), it volatilizes earlier, exhibits excellent initial rust prevention ability, and is recognized to have excellent overall volatilization performance.

Further, the solubility of the rust preventive agent of the present invention in a solvent was examined, and the results shown in Table 3 below were obtained. The numbers are for each solvent (25℃
) Dissolved amount (%) in 100g.

Table 3 As is clear from Table 3, the rust preventive agent of the present invention is advantageous in that it can provide a relatively concentrated liquid rust preventive agent.

Thus, according to the present invention, among the carboxylic acid amine salts, especially cyclohexylammonium carbonate) (
01 (0) and triazole rings, benzotriazole (BTA) or tolyltriazole (TTA) is selected, and 010 vs. BTA or OHO vs. TTA is 99
Since it is used as a preservative in a ratio of ~80 to 1 to 20, unlike the case where OHO and BTASTTA are used alone as a preservative, not only iron or its alloys but also copper or its alloys, zinc, and zinc are used as preservatives. It has a rust-preventing effect on non-ferrous metals such as plating and aluminum, and can prevent rust from assembling dissimilar metals such as iron and copper without disassembling it. This has the effect of providing a rust preventive agent with improved solubility in

[Brief explanation of the drawing]

Figure 2fTJ1 is a cut side view of an example of the rust prevention effect testing device.
FIG. 2 is a cut-away side view of a part of the vapor phase attainment test apparatus, and FIG. 5 is a graph showing the volatile characteristic surface at of the powder rust preventive agent. (1) Container (2) Lid (3) Rust preventive agent (4) Water (5) Cap a Test piece Space distance

Claims (1)

[Claims] Cyclohexylammonium carbonate (CHC) 99-80 vs. benzotriazole (BTA)
Or a volatile rust preventive agent such as zinc mixed with tolyltriazole (TTA) in a ratio ranging from 1 to 20 parts.