CS254655B1 - Means for temporary corrosion protection, media and its alloys in an alkaline environment - Google Patents

Abstract

The solution concerns the temporary protection of surfaces made of copper and its alloys in an alkaline environment formed also by ammonia with the occurrence of a weak acidic environment. Barrier protection agents, such as paints, waxes and oils, are inhibited by 0.01 to 5% by weight of dimercaptobenzothiazole, 0.01 to 5% by weight of its zinc salt and 0.01 to 1% by weight of dibenzyl sulfoxide. The use of dimercaptobenzothiazole and its salt is for the formation of protective coatings and for binding ammonia. The resulting ammonium salts also have a protective effect in combination with barrier protection. Protection in a weak acidic environment and when combining copper with vinegar is ensured by dibenzyl sulfoxide.

Description

254655

The invention addresses the use of thiazole compounds in the temporary protection of the medium and its protection by means of temporary protection against the combined action of inhibitors and ammonium.

The corrosion resistance of the media and alloys in the vast majority of existing applications in the alkaline environment is low to none. Pretosa protects the surface of products by means of temporary protection, such as oil, grease, micro waxes, plastics as well as greases, coatings and the like. Mostly, for all temporary agents, the protective barrier corrosion effect is increased by the use of inhibitors. Most of these inhibitors used successfully for iron and zinc alloys, due to their functional action, do not inhibit med1 and sometimes do not reverse, increasing them to corrosion attack. The application of cebinia in agriculture, the introduction of techniques into the soil and the production of fertilizers increase the occurrence of ammonia in the air. A] when at a content of 10 mg NH3 in m3 of air, one has to leave the space, the contents of up to 40 mg of NIls in m3 of air are known and the technique remains in this environment. Electro-technical products, measurement and regulation and electrical distribution are made of media and alloys. In the condensation of ammonia water, these surfaces undergo rapid destruction. Therefore it is necessary to protect the honey's] alloy against ammonia deposition.

The temporary protection means presently used, essentially, form a protective layer on the surface of the protected components immediately after application. Thus, only the part of the inhibitor which is in direct contact with it is involved in inhibiting the surface, thus the effect of the application must be ensured by an appropriate form in order to increase the effect. The remaining portion of the inhibitor is substantially unused. Therefore, a relatively large amount of inhibitor must also be dosed, which increases the protection and increases, for example, the emulsifiability of the protective layer and permits the transfer of aqueous solutions.

These drawbacks are avoided by using thiazole compounds and other complement inhibitors in the temporary barrier protecting compositions on the protected surface. Ich. the use is characterized by containing 0.01. up to 5 wt. % dimercaptobenzothiazole, 0.01 to 5 wt. % of its zinc salt, 0.01 to 1 wt. dibenzyl sulfoxide dissolved or dispersed preservative wax, oil or primer coat.

The use of dimercaptobenzothiazole by its chemical bond eliminates ammonia, and the ammonium sol1 also acts as an inhibitory, hence a small effect. Further, in the diffusion of aqueous solutions, it is transported in a soluble form to the protected surface. The addition of salts and the protection of the addition of additional inhibitors are provided by the addition of salts to protect alkali. The protective effects are proven to be about 0.01% by weight. of these inhibitors, simple dispersion can be used at particle sizes below 20 microns.

From the tests, e.g. with cooling water and from the temporary protection experiments carried out, a large protective effect was found for the mercaptobenzothiazole against ammonia water. The alkaline medium which is not formed by ammonia must be supplemented with a salt of dimercaptobenzothiazole. The zinc salt was verified. Thososol is water-soluble and protective surfaces are also formed upon diffusion of the aqueous solution to the surface of the medium. This form of protection is reliable in the presence of an alkaline environment in the case of transition to weak acidic concentrations! and combining the medium with the steel, the inhibitor system must be supplemented with a suitable inhibitor (e.g., tannin, dibenzyl sulfoxide, quinoline fraction, etc.).

With a total inhibitor content of from 0 to 5 wt. reliable copper protection was achieved even at a concentration of 40 mg NH 3 nametube cubic wet for a few days. The inhibitor inhibition can be thoroughly mixed into the temporary protection compositions by kneading the powder forms, or after being dispersed in a solvent capable of rapid evaporation, e.g., acetone, gasoline, ether, ethanol, chloroform, and the like.

The shortest potency times were achieved when using oils as a means of temporary protection for the rapid failure of barrier protection. Longer protective effects have been achieved with non-emulsifiable greases and fats. More importantly, microwaxes filled with low molecular weight polyolefins. In all of these compositions, dimercaptobenzothiazole also functions as an antioxidant and thus slows their aging. The very long-term effects are complementary to the complementation of typutiazole compound inhibitors into the base coat. In such a practical application, the. in S 2004 on the copper tube if no mechanical defect of the paint, no-occurred for a few years at all to attack

Laboratory tests have also proven the effectiveness of protecting steel surfaces, especially when combining them with the copper and its molds, even in the long term storage of protected products.

Specific application and long-term process verification was carried out by dosing 0.3% by weight. of dimercaptobenzothiazole, 0.3 per cent of its zinc salt and 0.1% of dibenzyl sulfoxide to microwax filled with low molecular weight polyethylene. Consistenciabola treated with gasoline. The dipping surface of 25-35 grams / m 2 with the combined NH 3, salt mist and SO 2 condensation test did not exceed 0.01 g / m 2 for steel for 21 days. day and medium 0.02 g / m 2. day.

In the next application, a friction protective coating of 0.25% was prepared.

Claims (1)

254653 of dimercaptobenzothiazole, 0.2% of its zinc salt, and 0.1% of dibenzylsulfoxide and deposited on a screw machine. It was also possible to unscrew the joint during the restoration of each polyproka, even when applied in a heavily polluted atmosphere. Further applications include the use of a preservative microwell with a polyethylene filled 0.2% dimercaptobenzothiazole, 0.1% of its zinc salt, and 0.2% benzyl sulfoxide on rolling bearings with an xnose cage. After two years of storage of the non-tempered shell after de-preservation by dissolving the microwax in the benzine in addition to the loss of brass gloss, no further changes were found. Further applications of thiazole compounds in the temporary protection conceived according to the invention are in the protection of measuring and control technology made from the medium and its alloy in an ammonia-containing environment. These include the protection of electrical terminal blocks and the storage of so-called standby stocks. The protection of the pressure gauges by this temporary protection prolongs several times their period of use without affecting the function. Further, it is relay protection of switches, switches, etc. if they are only located in an enclosed but not air-conditioned environment. DETAILED DESCRIPTION OF THE INVENTION A composition for temporary corrosion resistance of 0.01 to 5 wt. % of its zinc salt, preservative and its alloys in alkaline pro 0.01 to 1% by weight. dibenzylsulfoxide, dissolves also in the ammonia medium and in slightly acidified or dispersed in a preservative medium, characterized in that it comprises 0.01 to 5 wt. % dirnerkaptobenzothiazide.