DE3826324A1 - Anti-corrosion composition for metallic articles made from nonferrous metals or iron, methods of applying them, and their use as surface protection - Google Patents

Abstract

The patent discloses anticorrosion compositions for metallic articles made from nonferrous metals or iron, which compositions may, if desired, also have a decorative effect, and which consist essentially of synthetic and/or natural waxes and, if desired, further auxiliaries which regulate the solidification point of these waxes, and, if desired, light-fast and heat-stable pigments; methods of applying them to metallic surfaces, and their use.

Description

The present invention relates to anti-corrosion agents for metallic objects made of non-ferrous metals or iron, esp special ones made of iron, which may also be decorative Act.

The present invention further relates to a method their application to metallic surfaces made of non-ferrous metals or iron, especially iron.

Finally, the present invention relates to the use of anticorrosive agents, which may also at the same time act decorative, as surface protection of objects Nonferrous metals or iron, especially if they are plastic are designed and manufactured in very fine sections.  

The encaustic technique is known from Roman culture known, first ground on the marble slabs and then hot on the heated plates Beeswax, into which pigments had been stirred, were given. The marble slabs produced in this way colored pigment pads were used for jewelry purposes the walls of buildings.

As corrosion protection measures for metallic surfaces Surfaces are usually the following in technology Measures used:

A: Chro formed in suitable chemical solutions mat or phosphate layers,

B: Metal coatings, which by electrolytic metalab divorce, vapor deposition, flame spraying, plating or immersion in molten metal the,

C: Coatings with inorganic or organic deck layers,

D: plastic covers and

E: enamels.

In the case of organic coatings, the Corrosion-protective paint from an adhesion promoter base layer and a chemical resistant Top coat.

However, this method has the disadvantage that esp especially with plastically designed and very de waisted and finely worked metallic Ge objects by applying two coats of paint these objects embellish much of their structure lieren, the object by the applied color  layers solidified into a rough mask and also these anti-rust paints not in all ver deepen the object to be protected. This has the consequence that within a short time on this counter Corrosion coatings were again applied have to.

The present invention aims to sets, a corrosion protection agent for metallic Ge to provide objects made of non-ferrous metals or iron, in which the objects are not covered with a pasty at least 2 painting phases of existing corrosion protective film are stripped of their natural structure.

Rather, the present invention intends to Provide anti-corrosion agent, the metal objects with a wafer-thin, quasi un visible layer should surround, this layer deco if necessary by adding pigments acts relatively. This leaves the surface structure of the metallic object, for example Wrought iron because the (pigmented) Cor anti-corrosion agent in the surface structure of the Workpiece penetrates. The color that is created by the Pigments generated in the anti-corrosion agent is light and weatherproof, so that the protected counter would not be treated after years have to.

The invention consequently relates to anti-corrosion agents for metallic objects made of non-ferrous metals or Iron, which may also have a decorative effect, consisting essentially of synthetic and / or natural waxes and, where appropriate, other Solidification point of these wax regulating auxiliaries,  and optionally lightfast and thermostable Pigments.

Synthetic waxes in the sense of this invention can for example polyolefin waxes, Fischer-Tropsch Waxes or synthetic waxes with oxygen function len groups. Natural waxes in the sense of this Invention are natural vegetable waxes, natural animal waxes, montan waxes and macrocri stalline and microcrystalline paraffins. Prefers become natural for the present invention Plant or animal waxes are used. These are at for example carnauba wax, candelilla wax, ritamo wax, beeswax (yellow raw wax (Cera flava) or bleached (Cera alba)), wool wax and whale substitute. Mixtures of yellow or are particularly preferred bleached beeswax, for example imports Greece, in combination with carnauba wax.

Excipients that invented the freezing point of this regulate waxes according to the invention, can synthetic or natural resins as well as high-melting waxes be. Terpene resins such as mastic, Kolo are preferred phonium and olibanum and benzins such as benzoin, Peru balm and myrrh.

Pigments in the sense of this invention can be inorganic or organic pigments, insofar as they light stable and up to about 90 ° C, preferably 80 ° C, thermo are stable. These pigments can be used alone or in combination combination can be used. Such pigments are for example in the monograph "Painting Material and its use in the picture "by Max Doerner given by Toni Roth, Ferdinand Enke Verlag, 7th edition location, Stuttgart 1941.  

For example, iron oxide red (Caput mortuum), iron oxide yellow, iron oxide black, iron oxide brown, chrome oxide green, chrome red, oxide red, cadmium red, Vermilion, umber-natural, Veronese green (burnt green Earth), cadmium green, manganese blue, cobalt green, cobalt blue (light; dark), zinc iron brown, nickel rutile yellow, Chrome rutile yellow, cadmium yellow, chrome yellow, molybdate red, Molybdate Orange, Chrome Orange, Chrome Real Green, Zinc Green, Zinc real green, ultramarine blue, ultramarine green, ultra marine violet, ultramarine red, iron blue, permanent red, Phthalocyanine blue and phthalocyanine green.

The pigments described above as a component of Corrosion protection agents according to the invention are made from receive customary, commercially available pigments, by first passing them through a sieve to get rough ones Weed out the grains, then put the pigment together with turpentine oil and rub until the Pigment is evenly wetted by the liquid. The pigment thus concentrated is, after having been placed on a Glass pane has been rubbed with a glass grater stirred into a liquid wax solution, including when this mixture cools must be stirred well, to prevent the pigments from settling. The amount of the pigment in the anti-corrosion agent inevitably from the productivity or opacity of the individual pigments and can amount to 10 to 20% by weight In the case of anti-corrosion agents based of beeswax can be used for every pigment added the desired matt or glossy color Set the carnauba wax consistency control. In this way, almost every color shade can be set bar.  

Preference is given to anticorrosive agents which essentially Lichen from 50 to 80 wt .-%, preferably 60 to 70% by weight beeswax, 20 to 50% by weight, preferably 30 to 40 wt .-% carnauba wax and optionally to 5% by weight of the sub punch mastic and optionally 11 to 25 wt .-%, each Weil based on 100 wt .-% of the total corrosion protective means of one or more lightfast and thermostable pigments exist.

The present invention further relates to a ver extend to the production of a surface film an anti-corrosion agent of the above specified composition that is anti-corrosive and counter also has a decorative effect the surface treatment of metallic materials from non-ferrous metals or iron, but especially from Iron, for example wrought iron, the following Steps:

• a) Cleaning the surface of the metallic material fes,
• b) heating the metallic material or one Part of the same at temperatures of 60 to 90 ° C, preferably 80 to 90 ° C,
• c) heating the anti-corrosion agent of the above described composition at temperatures of 60 to 80 ° C, preferably 70 to 80 ° C and
• d) applying the heated anti-corrosion agent the heated metal surface.

In a further embodiment of the invention Manufacturing process is carried out after cleaning the Surface before heating the metallic material  First, apply a porous surface protection layer applied the metal surface. This is recommended especially with anti-corrosion measures that should be carried out when wet or damp len. It is preferably the porous upper surface layer around a spray galvanizing.

The surface can be cleaned by pickling, Ab grinding, sanding or sandblasting. The surfaces are preferably cleaned by sandblasting or pickling.

The metallic material is heated to a temperature of 60 to 90 ° C, preferably heated to 80 to 90 ° C, wherein care must be taken to ensure that the entire area is covered delnd part of this material is approximately the same Temperature. This happens, for example, with an acetylene-oxygen burner. Propane gas is due less suitable due to its higher hydrogen content, since water vapor forms when burned, the corro such as rust and so on Coloring of the pigmentation adversely affected becomes.

Generally, two to three hours should be at the latest after cleaning the surface with the application of Corrosion protection agents are started.

The application of the heated anti-corrosion agent can be used for details with a brush, for smaller ones Divide by immersion and in larger areas also done with a brush.  

Finally, the present invention relates to Use of anti-corrosion agents, as before is described, which may also be decoration act as a surface protection for objects made of non-ferrous metals or iron, especially if these are designed plastically and very finely divided are required.

Plastic objects in the sense of the for example, sculptures and Grid, such as grills indoors and outdoors, off casual, sign painting, cemetery design (grave crosses, borders and partitions) as well as in the church area (candlestick, rood screen with or without figurative jewelry, altars and accessories such as crosses and Candlesticks, retables, lamps, chandeliers, etc.) The invention is illustrated by the following games described.

Example 1 (Formulation of a corrosion protection with tels)

7 parts of beeswax with 3 parts were placed in a vessel Carnauba wax melted together and stirred until a homogeneous solution had formed. The after Cooling wax mixture formed can act as corrosion protective agent according to the inventive method be used, especially as surface protection of metallic objects, which are very finely divided have been manufactured. For wrought iron items the natural color of wrought iron should show, 1/2 to 1 wt .-% graphite in the melted wax mixture to stir through  blacks like Schwalk, often attached to the forging process, Carbon and tar, which by the necessary Reini before treatment with the anti-corrosion agent is removed to replace. Here is the graphite too sentence, however, only an aesthetic question.

Example 2 (Formulation of a dark green pigment containing, matt anti-corrosion agent)

0.5 parts each of the pigments chromium oxide green and iron oxide black, which was first passed through a sieve in order to separate out coarse pigment grains, a teaspooned together with turpentine oil and for as long in a mortar or on a glass plate with a Glass grater rubbed until the pigment flows through the rivers liquid had been evenly wetted. The so turned on dough pigments are in a liquid wax solution stirred in, which consists of 7 parts beeswax and 3 Parts of carnauba wax existed and after that in the example 1 described method has been produced. Man allows the pigment-containing wax mixture to cool, whereby you have to stir constantly to get the pigments in Disperse wax evenly.

After cooling, you get a dark green matt colored anti-corrosion agent.

Example 3 (Formulation of a red pigment-containing shiny anti-corrosion agent)

1.5 parts of the pigment permanent red, which initially passed through a sieve to remove coarse pigment Grains were separated out together with turpentine oil pitched and in a mortar or on one  Glass pane rubbed with a glass grater until that Pigment evenly wetted by the liquid that was. The pigment that has been soaked into a liquid sig wax solution, which consists of 6 parts ge bleached Greek beeswax and 4 parts car nauba wax consisted of up to 0.5 parts of mastic have been added, and which according to that in Example 1 described method has been prepared. Man allows the pigment-containing wax mixture to cool, whereby you have to stir constantly to get the pigments in Disperse wax evenly.

After cooling, you get a red, semi-matt silky anti-corrosion agent, which at its application on metal surfaces with a soft rags, e.g. a woolen cloth, to shine is brought. This increased shine looks like a fir nis, but does not have the disadvantage of yellowing like a common varnish.

Application example

With the help of the (pigment-containing) Cor Anti-corrosion agent was a latticework as a conclusion lattice of the main church room of a Catholic church treated application technology.

This grid with a height of approx. 5 m and one Width of about 8 m consisted of wrought iron, with many perforations and push-throughs, bindings and Connections. This grid should be with the Invention treated according to anti-corrosion agents and be colored in this treatment. Due to the plastic design of the latticework  is a coating with normal anti-corrosion agents not possible because there is a cross in the perforations rod is inserted. This is the inner part covered so that these points with normal corrosion Protective means can not be reached, so there Corrosion forms the color of such Grid destroyed. A long-lasting cor prevents corrosion protection. The boarding the anti-corrosive (pigment containing) wax mixtures on the surface of the git terwerk was carried out as follows:

First of all, part of the surface of this grid carefully cleaned at the factory, for example by Bei zen or by sandblasting.

The grid surface cleaned in this way will not, unless work in damp rooms, within approx. 2 to 3 hours further processed by the cleaned lattice surface using an acetylene Oxygen burner heated as evenly as possible and, after the wrought iron reaches temperatures of cooled down to approx. 80 to 90 ° C, then to approx. 70 to 80 ° C heated (pigmented) wax solution gives.

The liquid wax mixture runs at this temperature in all corners and corners of the treated in this way Grating surface. In this way it stays Maintain the surface structure of the forged iron, and the (pigment-containing) corrosion protection agent penetrates into the surface structure of this workpiece.  

The color and structure caused by the corrosion protective wax mixtures themselves or their combi nation with pigments light and weatherproof. When heating, as before standing mentioned on uniform heating of approx. 80 to 90 ° C, otherwise there is danger stands that the color pigments burn. In addition, must the corresponding parts of the latticework treated evenly treated with the wax-pigment mixture to achieve color uniformity.

If the painting is very different, it can be added later the color by slightly warming to approx. 50 to 60 ° C away or be of a different color be expanded as desired, so that retouching and color Changes are always possible.

Claims (9)

1. Corrosion protection agent for metallic objects made of non-ferrous metals or iron, if necessary also look decorative, consisting essentially of synthetic and / or natural waxes and, where appropriate, other Solidification point of these wax regulating auxiliaries, and optionally lightfast and thermostable pig ment. 2. Corrosion protection agent according to claim 1, characterized characterized that the waxes are natural waxes of animal or vegetable origin acts. 3. Corrosion protection agent according to claims 1 or 2 characterized in that it is the wax mainly deals with beeswax, the Carnauba wax and optionally terpene resins such as mastic as auxiliary regulating the freezing point of this wax substances are added. 4. Corrosion protection agent according to claims 1 to 3, in essentially consisting of 50 to 80 wt .-%, preferred wise 60 to 70% by weight beeswax, 20 to 50% by weight, preferably 30 to 40% by weight of carnauba wax and counter if necessary up to 5% by weight of the solidification point regulating substance mastic and optionally 11 to 25 wt .-%, each based on 100% by weight of the total anti-corrosion agent or several lightfast and thermostable pigments.   5. A method for producing a surface film of an anti-corrosion agent according to claims 1 to 4, which has a corrosion-protective and optionally also a decoratuve effect, in the surface treatment of metallic materials made of non-ferrous metals or iron, in particular iron, for example wrought iron, which comprises the following steps :

• a) cleaning the surfaces of the metallic material,
• b) heating the metallic material or a part thereof to temperatures of 60 to 90 ° C, preferably 80 to 90 ° C,
• c) heating an anti-corrosion agent according to the composition of claims 1 to 4 to a temperature of 60 to 80 ° C, preferably 70 to 80 ° C, and
• d) applying the heated anti-corrosion agent to the heated metal surface.

6. The method according to claim 5, characterized in that between process step a) and Ver step b) on the cleaned metal surface Chen applies a porous surface protective layer. 7. The method according to claim 6, characterized in that that this surface protective layer is spray galvanizing. 8. The method according to claims 5 to 7, characterized records that cleaning the metal surfaces by sandblasting or pickling.   9. Use of anti-corrosion agents according to An sayings 1 to 4, which may also be decorative act as surface protection for metal objects made of non-ferrous metals or iron, especially if these sculpted and very finely divided are.