DE1519023A1 - Water-soluble, anti-corrosion and lubricating products - Google Patents

Description

Water-soluble, anti-corrosion and lubricating products.

The invention relates to colloidal, water-soluble products which prevent the corrosion of metals and particularly of ferrous metals and alloys. In addition, these can be used according to Products made according to the invention can be used as lubricants for all work in metallurgy. Farther Some of them may have organic, non-hydrocarbon lubricating products be added, and especially to water-soluble lubricating products, so as to obtain colloidal solutions which protect against corrosion and which can be used as non-flammable lubricants, especially are suitable for hydraulic transmissions. However, you can also use hydrocarbon lubricants in In the form of aqueous, very stable oil emulsions that protect against corrosion can be added.

According to the invention, a water-soluble, corrosion-preventing element with a likewise water-soluble colloid and a wetting product so that aqueous, colloidal, anti-corrosive solutions attained suitable viscosity which on the one hand are capable of the metal surface to be protected to wet and as a result to spread on this surface, and on the other hand to adhere to it so that this

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Surface absorbs an even and suitable amount of this anti-corrosive colloidal solution during contact. The drying of this solution leads to the formation of a compact, firmly adhering layer on the to the water evaporation protective metal surface in which a very large proportion of the element protecting against corrosion is contained and which, so to speak represents a corrosion potential on the surface of the metal. According to another feature of the invention, this potential is determined according to the strength of the main corrosion factor, moisture, released because the colloids used are products that expand when they come into contact with waaser, so that this moisture is practically absorbed by the protective coating formed on the metal surface according to the invention. From this fluid intake the aforementioned protective covering results in the formation of the water-friendly layer represented by the covering An aqueous solution "immobilized liquid", which is a very large proportion of a water-soluble, which is corrosion contains preventing elements, and which is kept in close contact with the metal by the colloid soaked by it and which protects the metal to a high degree against corrosion. If the colloid used has self-wetting properties, the weeping product naturally becomes redundant. In addition, if the colloidal solutions according to the invention during have a tendency to foam in their use, add an anti-foaming product.

Long experience shows that the protection achieved by the invention is permanent and safe, even in a very humid atmosphere, as long as the protective layer is not mechanically removed or completely dissolved by water. Comparisons, in the course of long- term experiments (three to twelve months) and on industrial stocks, between the oils commonly used with so-called anti-corrosive oils and that with colloidal solutions according to the invention

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Achieved protection have shown that after the same time and under the same conditions, the metal after the removal of the protective oil or protective oil according to the invention, had a high-gloss surface when it was protected by colloidal solutions according to the invention, while it was often matt or sometimes even turned brownish when protected by oils. Furthermore, after a very long time, the local Eost attacks on the same external metal parts, which were protected by oil products on the one hand and by solutions according to the invention, but were all exposed to the same conditions, are three to four times more numerous and also deeper and more extensive in the case of protection by oils than was the case with protection by aqueous colloidal solutions according to the invention. It "is obvious, however, that the protective covering according to the invention, since it is water-soluble, cannot guarantee protection against rain or immersion of the metal in water, nor in general in all these cases when the metal to be protected is in direct contact with a larger metal Amount of water can come, which is able to carry out a correct washing process, which removes the protective sole by dissolving. The normal field of application according to the invention is the protection against corrosion of metals and especially of ferrous metals that are in contact with the atmosphere However, it must be emphasized that this area can be very extensive, since it is possible with certain colloids how some also from the ä following examples can be found, the protective layers ne ^ eh of the invention by means of complimentary or subsequently deposited on the protective layer reagent insoluble in water.

However, the water solubility of the protective covering according to the invention is an important part of the gate possible to remove the covering by simply washing with water, without the need to use any organic solvent in the event that the bare metal is needed again. Understandably After this washing, the metal must be dried

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to prevent its corrosion, because it is not more protected. Palis, however, should be served with enough hot water washes, drying is fast enough to avoid corrosion. It is also preferable to use a diluted one Wash aqueous solution containing corrosion preventive element.

The effectiveness and duration of the protection of metals by means of products according to the invention depends on the one used Colloid different. It follows that the choice of colloid depends on the intended use. For example, if you on a cheap protection of a relatively short duration or on a very effective and very permanent protection or if you if the aim is lubrication rather than protection, the colloid that has the best properties for each case will be used having. Furthermore, the inventor has found that the effectiveness and the duration of the Sohutzbeläge according to the invention can be increased if one of the corrosion-preventing colloidal solution fine powder additives are added, which make it possible to obtain correct anti-corrosive water colors, which afterwards Drying creates thicker coatings that are more resistant to damage, but can still be achieved by simply washing with water can be removed. For corrosion caused by chemical vapors, protection can still be durable Solutions according to the invention considerably by adding a neutralizing additive, e.g. fine calcium carbonate powder, increase.

Wg-s relates to their use as lubricants the colloidal solutions according to the invention without the addition of any other products, for example when bending the Iron strips are used in the manufacture of welded tubes. You can use the same product for lubrication and use for protection, which makes it easier to streamline work. In addition, prevent the used as a lubricant Products according to the invention do not involve high-voltage or low-voltage welding; and the application of the aqueous colloidal

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solution intended to protect the pipes is no longer hindered by the presence of oils on the metal surface. The same goes for rolling and wire drawing.

As mentioned above, the inventor has determined that to self-lubricating, anti-corrosion and non-flammable coolants for radiators, hydraulic Gears and machine tools are called colloidal ones Solutions according to the invention can add water-soluble products that have lubricating properties such as polyalcohols, Polyepoxy glycols, polyamino alcohols and polyamino alcohol salts without reducing the corrosion protection. ™

In addition, the colloidal solutions according to the invention can contain lubricants consisting of hydrogen compounds can be added, e.g. mineral oils using tensio-active products, which are preferably soluble in oil like petroleum sulfonates, soaps or the non-ionic surfactant products derived from epoxies. Dense emulsions are obtained which, when drawn, can be used in removing the shapes, etc. By diluting with water, white emulsions for metalworking are obtained on machine tools.

It can be seen that the ways in which the invention can be applied are very numerous. As for protection against corrosion, whether it is metal parts that are processed, stored or transported, one can say that the Invention is always useful when the surface of the metal and especially a ferrous metal against the through Moisture, corrosion caused by dust or chemical vapors should be protected and also, if the numerous, Work carried out in metallurgy requires »lubrication. Aside from these major uses, there is one large number of secondary applications. It would be too tedious to list them all. By the way, those will

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to whom the invention brings the solution to their problems, know how to recognize these special types of application without the need for it will be to point them out. As an example one can see the use of the colloidal solutions according to the invention as before List of anti-corrosive glues that allow this metal to be counteracted by simply sticking paper to the metal protect against corrosion without the need for paint or tinning. One can protect against corrosion on the same Arx Manufacture packaging for sea transport of parts or machines. Furthermore, the colloidal, can protect against corrosion the solutions according to the invention are inserted into the paper pulp.

What those in the colloidal solutions according to the invention As far as the colloids used are concerned, a great many products are useful. One can say especially but not limitatively: colloids of vegetal origin such as the agar agar, the alginates, mucilage, gum, especially guar gum, the starches, yeast, the Degradation products of starch and yeast, gluten, eyelets and polyoses, etc .; Coloids of animal origin such as casein, Gelatin, albumin, etc .; chemical or synthetic colloids such as carboxymethyl celluloses, polyvinyl alcohols, water-soluble ones Resins, alkyds, phenols, melamines, etc. As mentioned above, Many factors play a role in the selection of the appropriate colloids in relation to the intended use of the solution. For example the colloid density to achieve a suitable viscosity, the strength in relation to the protect against corrosion de element, the ability to adhere to the metal, the resistance against removal and against damage, the possibilities of making the solution insoluble and of course the manufacturing price. Colloids, which are viscous solutions at low density, are generally suitable for applications relating to lubrication result, while colloids, which are the most resistant coatings, are preferable to protect metallic surfaces

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against damage and removal.

As for the anti-corrosive elements that are in the composition of the colloidal anti-corrosive Solutions according to the invention are contained, there are also numerous water-soluble suitable products The most effective, easiest to use and cheapest are alkaline nitrites. It is also possible to use products made in the Neutralization of amines, polyamines, amino alcohols, polyamino alcohols by means of acids, the salts of which have anti-corrosive properties, such as chromium, phosphorus, phosphorus, nitrite, Boric, nitric acids etc. But in general nitrites and for special types of application such as lubrication, phosphates and organic-based chromates as corrosion-preventing elements preferable. The additives to the colloidal solutions for obtaining anti-corrosive paints are generally fine and absorbing mineral powder, lime, kaolin, asbestos, clay, Calcium carbonate, lead cardonate, zinc sulphate etc. or cellulose powder or wood flour or even stainless metal or Aluminum powder coated to prevent the metal from decomposing · The aluminum powder can also be Lubricating properties are used because of.

If you want to achieve rapid drying, you can use certain solutions according to the invention a water-soluble, volatile Add solvent such as a low molecular weight alcohol.

Furthermore, it is often necessary, especially in warm countries, to add an agent to the colloidal solutions according to the invention, that prevents fermentation "

If one wishes to obtain protective coverings which adhere very firmly to the metal and which have a very high mechanical strength Resistance to damage and erosion

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own, the inventor had the idea, instead of organic To use colloids, mineral products that have properties similar to organic colloids, but which are based on the Drying results in much more resistant coverings. Alcaline silicates in particular have such mineral products very good results. Associated with corrosion prevention water-soluble elements in a carefully determined proportion in order to obtain aqueous stable solutions, in particular with an alkaline nitrite, they allow after drying the said, on the surface of the metal to be protected applied aqueous solution that achieves protective coating which are particularly resistant to damage and which can be used as a corrosion-preventing base, if you want to paint the metal surface afterwards.

Similar results are achieved with borates, and especially with organic borates (amines, polyamines, amino alcohols etc.) · The coverings are less resistant than the those made with silicates, but the borates mentioned have their own corrosion-preventing properties, so that in many types of use, e.g. as a lubricant, there is no need for another water-soluble corrosion add preventive element.

Finally, the solids in the colloidal solutions are used to facilitate the application and to save on transport are included according to the invention, as powdery, dry, water-soluble mixture. These powders are made by mixing, grinding and kneading or else by evaporation of the solids forming the solution.

Examples

1. 30 to 35 \ l sodium alginate pulversisiertes a suitable 'type in order at a density of 3 to 4%, the desired viscosity

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for -to achieve the aqueous solutions according to the invention dissolved in 900 liters of water at ambient temperature. When the colloidal solution is quite even, dissolve 50 to 100 kg commercial crystalline sodium nitrite, and then 1 to 5 kg "Teepol" or better 2 to 5 kg of a condensation product of octyl or phenolnonyl with 5 to 10 ethylene oxide molecules. A wetting, corrosion-protective colloidal solution of medium viscosity is obtained, which is the same for all of the above Uses suitable iDt. In particular, these solutions can be applied by moistening, painting or spraying on each Ferrous metal object to be protected from corrosion caused by moisture. For application purposes, at which could prevent the formation of foam (e.g. lubrication) f | 0.1 to 0.8 kg of a silicone is added as an anti-foaming element.

2. Instead of using 30 to 35 kg of alginate as stated in Example 1, 2 to 5 kg of purified powdery guar gums are used. You can also replace the Oxyäthylenphenolaklyl by an oxyäthylenisches Alkylaminopropylenamin. An economical colloidal solution is obtained, which is suitable for the above-mentioned purposes, but especially for certain lubrication work in metallurgy, such as bending metal strips in the manufacture of welded pipes or to obtain protective coverings of limited duration. λ

3. In the composition mentioned in Example 1, one replaces the alginate by 20 to 40 kg of a breakdown product of starch gum which is soluble in the cold state, whereby one is gradually and carefully preferably operates at 30 to 40 ° C. The anti-corrosion colloidal solution that can be obtained in this way finally achieved, is suitable for all of the above uses. They can also be used as corrosion-preventing glues serve that protect the unprotected iron by simply sticking paper that can be printed for the purposes of use

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(Trays or cans and canisters, for example). They can equally be introduced into the paper pulp before To obtain packaging materials that protect against corrosion.

4. In the composition mentioned in Example 1, the Sodium alginate by 20 to 60 kg of xiarboxymethyl cellulose or replaced by 50 to 100 kg of gelatine or a water-soluble phonol resin, all the more so for protective coatings that adhere very firmly to the metal to obtain,

5. 50 to 100 kg of dry casein powder are placed in 800 liters of water at a temperature of 20 to 30 ° C. and mixed. After a few hours of boiling or, better still, after stirring during the same time, 10 to 20 kg of dry commercial borax powder is dissolved. and the mixture is heated up to 50 to 6O ⁰ C. In the thus obtained colloidal solution to dissolve 2 to 5 kg of a oxyäthylenischen Alkylphenoles and 30 up to 80 kg crystallized commercially available sodium nitrite to. A colloidal solution is obtained which protects against corrosion and with which very firmly adhering and very effective coverings for protecting iron metals against corrosion are obtained. Such solutions can also be used as glues protecting against corrosion.

6. 50 kg of an aqueous sodium nitrite solution of 10 to 20 l <> Density mixed added 50 kg of an aqueous Kolloidailösung with 10 to 15 fo a polyvinylic Alkoholes a kind of medium viscosity that has a saponification index of 130 to HO. 100 kg of a colloidal anti-corrosion solution according to the invention are obtained, which is almost colorless and completely clear and with which water-soluble, transparent, elastic and damage-resistant coatings are obtained on the metal surfaces to be protected against corrosion. These solutions also form, in themselves or combined with water-soluble lubricants, such as, for example, with polyalcohol, polyepoxyglycol, polyaminoalcohol, etc., very good corrosion protection and

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non-flammable lubricants for hydraulic gears, self-lubricating cooling for working with machines and tools etc. Despite the addition of these water-soluble lubricants, some of which have corrosive properties, none exist Risk of corrosion. Sodium nitrite can also be used for applications related to lubrication and especially cutting by a neutral phosphate or organic-based chromate e.g. Triethanolamine, Mopholin or a water-soluble polyamine replaced will.

7. 30 kg of a mineral oil of the "Spindle" type with a viscosity of 2.5 ° Engler at 50 ° C or a synthetic oil of the same viscosity a mixture of 10 kg of an oloidal solution is added according to Example 6 and also 10 kg of petroleum sulf which is soluble in oil onat. A viscous, clear emulsion which is suitable for the work is obtained. Diluted with water forms the concentrated Emulsion White, very strong, corrosion-protecting emulsions for working on machine tools.

8. 150 kg of a commercially available aqueous sodium silicate solution of 38 ° Baume are diluted with water approximately their own weight and then 350 kg of an aqueous 12 to ± 5 ^c / o ± _& en sodium nitrite solution are added. Gives an aqueous corrosion protective solution according to the invention, after addition of complaints 0, i> fo a moist product. The viscosity of this solution can be met by adding a 38 ° Baume sodium silicate solution. The protective coverings obtained with such solutions are very resistant to damage and removal. They can be applied without the need for pickling.

9. An aqueous triethanolamine or triisopropanolamine solution containing 20 to 40 % organic basis is neutralized by means of a boric acid. JThe thus obtained neutral, from corrosion

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protective colloidal solution is used as a lubricant, as a self-lubricating one Coolant or used to protect iron details.

10. In Examples 1-8, the sodium nitrate is replaced by a phosphate, a phosphite, a chromate, a nitrate or a borate water-soluble organic base replaced.

11. The colloidal solutions according to Examples 1-10

20 to 40 io talc, kaolin, asbestos, calcium carbonate, lead carbonate or zihksuifid etc. added in fine powder to obtain water-soluble paints that protect against corrosion. To protect against corrosion caused by acid fumes, it is preferable to use a neutralizing powder such as calcium carbonate or lead carbonate. Cellulose powder can also be used. The coated aluminum powder is used for lubrication without any further additives.

12. Steel sheets are immersed in a colloidal solution according to Example 1 and then allowed to drain. One atomizes then an aqueous sodium silicate or aluminum sulfate solution of medium concentration on the surface obtained in this way. This increases the resistance to damage to the protective covering.

13. A metal surface treated with a colloidal solution after Example 6 has been coated, is exposed to the action of formol vapors or an atomization of an aqueous formol solution. The coating, which protects against corrosion, is made water-insoluble. Furthermore, by adding to this same solution According to Example 6, a few percent glycerol is obtained which is plasticized against corrosion on the metals to be protected Coverings that remain soluble in water. In addition, by atomizing an aqueous borax or resorcinol solution before or after

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the application of a colloidal solution according to Example 6 on a vertical surface a gelinization, which prevents the sliding of the solution covering this surface.

14. The powdery product obtained by the degradation of starch gum in Example 3 is ground in specified parts with a crystalline alkali nitrite and kneaded until a uniform powder is obtained. The uxyethylalkyl-phenol is added to this powder by atomization during the Kent process. A powdery product is obtained which, by dissolving it directly in water, makes it possible to obtain anti-corrosive colloidal solutions according to the invention. A.

It should be noted that the invention is not based on protection against corrosion and is limited to lubrication only of ferrous metals, although these problems are the most important ones encountered in the Metallurgy need to be resolved. In particular, the invention allows also protection against white rust from zinc and galvanized metals.

The invention applies to water soluble products to protect metals and especially ferrous metals against corrosion, Products whose aqueous solution is also used as a lubricant for the work carried out in metallurgy is usable and the combination of a water-soluble and water-friendly Colloid consists of a corrosion-preventing, water-soluble element and a wetting product.

The products according to the invention can be obtained in powder form, but they can also be obtained in aqueous solutions suitable viscosity can be used.

The products according to the invention, in aqueous solution, wet the surface of the metal, spread on it and cling to it. This surface keeps a uniform and

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Sufficient amount of this solution back to form a compact and firm adhesive protective covering after drying has a very high proportion of the corrosion-preventing element and thus prevents corrosion on the metal surface maintains protective potential. This potential is released when the floor covering is absorbed by moisture expands. An aqueous, very concentrated solution of the corrosion-preventing element is then formed in which the liquid is immobilized on the entire surface of the metal by the colloid it has soaked and in close contact held with the metal, which is so absolutely protected against corrosion.

The protective coverings obtained by the products according to the invention, however, cannot protect against flowing through or through Protect water caused corrosion, but ensure effective and permanent protection against moisture, dust and corrosive fumes. However, it is possible by means of the colloid added or on the protective layer after its application applied reagent to make this layer insoluble in water.

By adding insoluble powdery additives to the anti-corrosion colloidal solutions after In accordance with the invention, water-based paints that protect against corrosion can be produced, which allow a more effective and lasting effect Achieve protection. The protective coverings that are formed by products according to the invention can be cleaned by simply washing can be removed with water without any organic solvent.

The fields of application of the products according to the invention are extremely numerous. They can be used in all of the cases in which the surface of a metal and especially a ferrous metal or an iron alloy against by

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Corrosion caused by moisture, dust and fumes must be protected. Various special types of application can also be used in Consider, for example, the gluing of paper to metal by means of solutions, of products according to the invention, to the To achieve protection of the metal through its packaging or its cladding. The solutions mentioned can also be of the paper pulp attached. As regards the use as lubricants, the aqueous solutions of the products according to the invention water-soluble lubricants such as polyalcohols, polyepoxy glycols, polyamino alcohols, etc. can be attached to self-lubricating coolants for metalworking, hydraulic transmissions or for vehicle radiators etc. to get.

The aqueous solutions of the products according to the invention can also with lubricating hydrogen compounds by means of tension-active products are connected in order to obtain very stable emulsions which protect against corrosion and which are suitable for bending or machining of metals can be used.

Numerous colloids can be used to make the products of the invention. The nature of these colloids depends on the area of application. One uses: Vegetal colloids

such as agar-agar, algenates, glue glue, gum, in particular guar gum, starch, starch gum, degradation products of starch and des Starch gums, gluten, eyelets and poly eyelets, etc; Colloids, minerals animal origin such as casein, gelatin, albumin, etc .; Colloids of chemical or synthetic origin such as carboxymethyl cellulose, polyvinyl alcohols, water-soluble resins such as phenolic or Milanese resins, etc.

Sodium nitrite is the preferred anti-corrosive element for assembling the products according to the invention or generally an alkaline nitrite. You can too

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use water-soluble organic-based products such as chromates, Phosphates, phosphites, litrates, borates, salicylates, etc. For lubrication salts of water-soluble organic bases and of acids, the salts of which have corrosion-preventing properties, are preferably used have, in particular of chromates, phosphates, neutral polyamine alcohol, morpholine or water-soluble polyamine borates.

The additives for the production of water-soluble paints for protection against acid fumes are generally finely ground water-insoluble rocks, in particular carbonates; however, cellulose powder or metallic powder such as aluminum powder is also used, which is also used because of its lubricating properties.

In order to obtain very resistant and very well adhering protective coverings that protect against corrosion, one uses mineral products, their properties which organic colloids are similar, in particular alkaline silicates, in order to obtain solutions that are made from the silicates mentioned a water-soluble corrosion-preventing element and consist of a wetting product which, according to the invention, allow to obtain particularly resistant protective coverings on the metal surfaces to be protected against corrosion

In order to accelerate the drying, the aqueous solutions of the products according to the invention are given a water-soluble one dissolving solvent too.

Palls the formation of foam when using the solutions according to the invention is a hindrance, a foaming-preventing product is added.

The invention relates to protection against corrosion and on the lubrication of metals that are not ferrous metals. In particular, it allows zinc to be protected against white rust.

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Claims (12)

Claims 1. Water-soluble, anti-corrosive and lubricant Serving product, characterized in that it consists of a mixture of a water-soluble colloid, one as well water-soluble, anti-corrosive product and a wetting product. 2. Product according to claim 1, characterized in that as Colloid preferably agar, alginates, molds, gums, especially guar gum, the starches, yeast, the devaluation products of starch and yeast, gluten, usen and poiyoses etc. or colloids of animal origin such as casein, gelatin, albumin etc. or chemical or synthetic colloids such as carboxymethyl celluloses, We use polyvinyl alcohols, water-soluble resins, AlKyds, phenols and melamines. 3o product according to claim 1, characterized in that as Alkaline nitrites should preferably be used to protect against corrosion. 4. Product according to claim 1 and 2 for use in the üer position of paints, characterized in that fine and absorbent mineral powder, for example lime, kaolin, asoest, Clay, cellulose powder, wood flour or rustproof metal or aluminum powder can be added. 5. Product according to claim 1-4, characterized in that a water-soluble, volatile solvent, e.g. an alcohol with a low molecular weight, is mixed in, 6. Product according to claim 1-5, characterized in that 909826/131 k before or after application a reagent is added to make the product insoluble in water. 7. Product according to claims 1-6, characterized in that a neutralizing additive, e.g. calcium carbonate powder is mixed in. 8. Product according to claims 1-7, characterized in that water-soluble products with lubricating properties, e.g. polyalcohols, Polyepoxy glycols, polyamino alcohols and polyamino salts are mixed in, 9. Product according to claims 1-8, characterized in that lubricants consisting of hydrogen compounds, e.g. Mineral oils are mixed in. 10. Product according to claims 1-9, characterized in that products protecting against fermentation are added. 11. Product according to claim 1 and 3-10, characterized in that mineral products with instead of organic colloids similar properties, preferably alkaline silicates are added. 12. Product according to claim 1-11, characterized in that a foam formation preventing product is added. 909826 / 13U