DE2121431B2 - Anti-rust coating agent for components and scaffolding made of weather-resistant, low-alloy steel - Google Patents

Description

5. Anti-rust coating agent according to claim 4, period of exposure flows out.

characterized in that it contains 0.1 to 5% sulfur

contains. _a5 flowing grate consists of an oxide pigment,

which contains manganese dioxide, and from a film-forming component, so that if a weatherproof low-alloy steel is coated on the surface with such a film (this will be referred to in the following 30 can be referred to as a "film to prevent flowing rust"), water ingress from the

Outside through to the surface of the steel

the action of the film-forming components can be hindered, while the oxide pigment, which 35 contained in the film, a bridge for the oxygen in a film to accelerate the stable Rust can form and at the same time act as a carrier for oxygen as a result of the catalytic effect the manganese dioxide contained in this film,

The invention relates to anti-rust coating agents for removing oxygen continuously from the outside Components and scaffolding made of weather-resistant through the film on the bottom of the steel surface low-alloy steel that can be supplied with a film-forming feed.

contains composition and oxide pigment. If the weatherproof low-alloy steel that comes with

It is known that a weatherproof low-alloy rust prevention film steel has a property that when coated on the 45 exposed to the above-described atmosphere of action, a hard compact film mechanism is exposed to the atmosphere is formed on the surface of this steel after the oxidation of the bottom of the steel surface several years have elapsed, whereby the further under the film to prevent the flowing corrosion can be prevented. Since the weatherproof grate accelerates without the process of the ge low-alloy steel, therefore, a several times higher 50 living moisture corrosion will go through, weather resistance shows than an ordinary steel, that is, without a flowing rust is formed, as it is used on a large scale for buildings and Scaffolds of active oxygen (in atomic form) turn to the surface, which is particularly exposed to the atmosphere and supplied to the steel surface through the film. However, even this weatherproof low-alloy steel probably has a disadvantage that water penetrates the bottom of the steel, namely that it is not free of the steel surface due to the effect of the film-forming of the formation of a yellowish brown rust (the component (binder) is kept to a minimum in the The following should be called "flowing rust"), since, in addition, the iron oxide, which is generated on the ground before the above-mentioned hard, compact protective layer of the steel surface, is formed with the rust it contains. Such flowing rust becomes oxide pigment in the film to prevent the causes various troubles, namely, that flowing rust is included, this iron easily flows out of the steel surface or becomes more compact, thereby further advancing peeling after the steel parts are stacked whereby the corrosion is restrained without not only unnecessary consumption of the steel parts flowing and the formation of rust.

is caused, but also the environment of construction This oxide film shows z. B. a blackish brown

Works and scaffolding, which from this 65 or dark brown color, is compact and hard and spotty Steel parts are made. has sufficient weather resistance. Hence he has

The aim of the invention is to give these various an effect similar to that of an ordinary protection problem to solve, which by the generation of rust is comparable to that on the surface of a

formed solely from weatherproof, low-alloy steel. When the steel surface is formed, the film can become whichever component of the atmosphere ages for 4 to 5 years.

was set, and after the film for prevention Conventional paint films that in general of the flowing rust in the above-mentioned oxide film on steel parts are mostly used for has been converted, this oxide film shows for 5 prevention of rusting. For this purpose, it has had a rust preventive effect for a very long time. In this case, the entire oxide pigment can only be a film-forming component (binder) to convert manganese dioxide, but it is to prevent the penetration of water and gases (air worth seeing in order to improve the hue of the film for preventing and corrosive gases) and such pigments for the purpose of flowing rust, an oxide is composed which has an effect as an inhibitor use pigment made from manganese dioxide and have such. B. lead oxide, red lead (PbjOJ and one or more other oxide pigments, zinc chromate. However, if such a conventional z. B. iron oxide, copper oxide, titanium oxide and lead rust preventive paint is used to the oxide. In this case, however, it is necessary that the surface of a weatherproof low-alloy steel, Amount of manganese dioxide at least 1% and that of 15 as the invention aims to paint, and Oxide pigment, which contains manganese dioxide, 30% of the painted steel should be out of the atmosphere. If the oxide pigment is set less than 30%, the rusting of this steel is prevented, so there is hardly a bridge for supplying the rust preventive ability of this paint to the base of the steel surface film, but if this rust prevention the film for preventing flowing rust 30 capacity of the paint film due to its On the other hand, since every other oxide pigment reduces aging after a few years, rust is formed as manganese dioxide itself is so weakly formed in its acidic steel surface, and this rust is Is the ability to transport matter, there is no BiI - nothing more than flowing rust. Therefore, the formation of an iron oxide film on the base of the steel conventional paint film only has the effect of delaying the surface removal during the course of a few years. only with these other oxide pigments. If, however, at least 1% manganese dioxide is contained in the invention, it is very effective, the proper film for preventing flowing rust Oxygen transport capacity is contained by its catalyst sulfur. Such sulfur can sulfur The effect is markedly increased, and an iron oxide film can be a sulfur compound or a sulfur-containing one be formed on the bottom of the steel surface, 30 substance and can be in the shape of one or while still a film to prevent flow- several of these forms may be included. It is already the rust is present on the steel surface. It is known that sulfur is an element that accelerates corrosion. As a result of the exposure tests it is desirable that the upper limit of the amount of many weatherproof low-alloy steels and of the oxide pigment is high. However, if its content 35 of the study of the films for the prevention of is too high, such disadvantages arise that the spray flowing rust on these nozzles has been found for many years in the production of a film for accelerating according to the invention the fact that sulfur, The formation of stable rust clogs have hitherto been regarded as a harmful element and the tackiness and adhesiveness of the film has deteriorated, since it is hindered by corrosion and oxidation. Taking these facts into account, 40 tends to greatly help create a compact it is therefore desirable for the upper limit to form protective rust, and this is made possible by the for the oxide pigment is about 70%. Reaction of the sulfur, which is next in the invention-AIs in the following d> e thickness of an appropriate film to prevent flowing rust such a film to prevent flowing rust is included, with the reason for the steel surface. 45 works. In this case, it is desirable that more The thickness of the film is narrow with its properties as 0.05% sulfur in the form of at least one and its lifespan. If he is too thin of the substances sulfur, sulfur compounds and is, film defects are generated such as B. fine holes containing sulfur-containing substances. This means, and paint irregularities, and it will when the sulfur content is less than 0.05% further causes moisture corrosion which has substantially no effect of the addition of observed the formation of a stable oxide film on the base of sulfur, d. i.e. there is no difference counteracts the steel surface, and a flowing between this case and the case of a film for Rust is generated. On the other hand, if the film thickness is prevention of flowing rust, none If it is too large, such defects as a wrinkle containing sulfur often occur, and not only in the duration of the formation of the film. 55 of a stable iron oxide on the base of the steel-The film-forming component, which is the base of the surface, but also in the iron film formed according to the invention to prevent oxide films themselves. On the other hand, if the is flowing rust, one or more of sulfur content is more than 0.05%, one occurs those resins are obtained which are selected to have a noticeable effect of the addition of sulfur, from acrylic ester resins, styrene resins and phthalic acid 60 d. that is, it becomes much more compact iron oxide film resins and such rubber derivatives as cyclic formed earlier than in the case of a film for rubber, rubber chloride, coumarone resin and preventing rust from flowing that does not contain sulfur Alkyl polysulfide. This film-forming component is used to contain. However, if the sulfur content is too high, to the fact that manganese dioxide or other oxide pigments is not only the weldability of the steel than to keep manganese dioxide so that a film on the 65 deteriorates, but also the spreadability of the Steel surface in the atmosphere during the film-forming solution itself is deteriorated because is formed over a period of at least two to three years. the amount of additive that is required to make one After a stable oxide layer once on the above mentioned 5fchwi> fei> n> hait "n" - hold

becomes very big. From this point of view, an upper limit of the sulfur content of 10% is desirable. The optimal range for the sulfur content is 0.1 to 5%. As the above-mentioned sulfur compound, sulfates and sulfides can be used, such as. B. CaSO ₄ , NiSO ₄ , ZnSO ₄ and CuS, hard rubber and alkyl polysulfide.

The following shows the results of experiments illustrating the invention.

Table 1 and the figure show compositions of solutions for forming a film for Prevention of running rust, which is made up of three components manganese dioxide, black iron oxide and Hard rubber powder (25.1% S) are each composed of different amounts, these solutions being using a normal temperature drying acrylic ester resin as a binder, and results obtained by applying these solutions to the surfaces of test pieces of weatherproof low-alloy steel (composed of 0.08% C, 0.42% Si, 0.37% Mn, 0.094% P, 0.041% S, 0.20% Ni, 0.30% Cu and 0.60% Cr, dimensions 50 X 150 mm, Thickness 3.2 mm), which are descaled by shot peening, in a thickness of 25 to 30 μm and by the Atmosphere exposure of the films thus obtained, Table 1 showing the time when a compact oxide film was formed on the surface of the exposed piece and the state of the bottom of the steel surface at that time. The figure shows the changes in the amount of

ίο iron removed from the sample surface during the Test duration of exposure flows out, as already mentioned. The so-called amount of what has flowed out here Iron denotes values that were obtained by an analysis which was based on the amount of Fe- which flows out into water which flows down the surface of the sample when deionized Water is sprayed onto the surface of this sample at regular intervals with the purpose of preventing the outflow on flowing rust to determine the surrounding area

ao stains structures and scaffolding and consumes the steel material, as mentioned at the beginning of the description.

Table 1

Sample pigment in% ^No oxide pigment in%

Manganese black overall dioxide iron oxide

Hard rubber powder total T ) ° is% S

Time (in months) in

Oxide film rust on the Steel surface was educated

Surface condition after the time mentioned on the left

19th

no compact oxide yellow-brown flowing

film was formed rust

B.
C. 0.5
1 29.5
29 30th
30th 0
0 30th
30th the same
24 D. 18th 12th 30th 0 30th 28 E.
F. 1
1 29
29 30th
30th 0.04 (0.01)
0.2 (0.05) 30.04
30.2 24
21 G 24 16 40 20 (5.0) 60 15th H 0.5 59.5 60 0 60 no I. 1 59 60 0 60 film ν
24 J 30th 30th 60 0 60 18th K 1 59 60 0.2 (0.05) 60.2 22nd L. 30th 30th 60 0.4 (0.1) 60.4 16

the same

dark brown compact oxide film grate the same.

the same

black-brown compact oxide film grate the same.

no compact oxide yellow-brown flowing rust forms

dark brown compact oxide film grate desgL

black-brown compact oxide film grate desgL

As can be seen from Table 1 and the figure, it is necessary that the manganese dioxide amounts to more from i% and that the oxide pigment which this Manganese dioxide contains 30% - If these conditions are not met, a flowing residue is formed If the sulfur contained in the film is less is than 0.05%, the reaction becomes generation of a compact oxide film grate is not accelerated, and the effect of the addition of sulfur is not ascertain.

6 _S Concrete examples of the weather-resistant low alloy steels that are the object of the invention are shown in Table 2, but the invention is not limited to these examples.

2 7th Si 0.25 to 0.75 21 21 Mn 431 (^ 0.07 to 0.15 8th S. Cu 0.15 to 0.30 0.20 to 0.50 <O, O35 <0.035 025 to 0.55 Tabel Chemical composition in% 0.25 to 0.75 0.70 to 1.25 0.035 to 0.12 <O, O35 0.25 to 0.40 C. <O, 35 <1.20 <0.04 <O, O35 0.25 to 0.50 <0.12 <0.60 <1.4 P. 0.06 to 0.12 <0.04 0.25 to 0.4 1 0.10 to 0.19 <0.55 <0.60 <0.040 <0.04 0.2 to 0.5 2 <0.12 0.10 to 0.80 <1.20 <0.15 <0.04 0.20 to 0.50 3 <0.18 <0.60 <i, o <0.120 <0.03 0.3 to 0.6 4th <0.12 0.30 to 1.0 <0.04 0.2 to 0.50 5 <0.18 6th <0.15 7th <0.15 δ

Chemical composition in%
Cr Ni V Ti Mo Nb

0.30 to 1.25 <0.65 - - - -

0.40 to 0.70 - 0.02 to 0.10 - - -

0.40 to 1.0 <0.65 - <0.15 - -

0.20 to 0.50 _ - - - -

0.4 to 1.2 - - - <0.35 -

0.4 to 1.20 - <0.10 - <0.35 <0.10

<1.0 <0.65 <0.10 - <0.20 -

0.30 to 1.0 <0.50 - - - <0.04

Description:

CORTEN O. 3 Hi-YAWTEN. 5 CUPTEN S. G. 7 CR2-60.

CORTEN A-C. 4 N A W. 6 CUPTEN 5OY. 8 River Ten 50M.

Concrete examples will be explained in the following: Tri-alloy steel (1.) 3.2 mm thick

1. Chemical composition of the used and a size of 300 X 300 mm were herwetterproof Low-alloy steel: made, shot-peened to remove the mill scale from the

"," ■ ,. Λ-oo / w _nn nn./D surface to be completely removed, then each with

f'o 18 V 4 0 28 »/ Cu and" 0 597 Cr 35 the solutions a), b), c), d) and e) by air spraying

S, 0.18 / " Ni, 0.28 / _a Cu and υ, Μ /" er. _{covered and} naturally dried to make films

2. Compositions for the solutions for preventing flowing rust of a thickness of dung of the film to prevent flowing rust: 25 μπι to form.

Weight percent ie ^ ^au * this way, each of films for preventing tion 40 of flowed rust coated five samples

a) Acrylesterharz ......... tu _WUR the exposed outdoors. On a surface

(drying at normal temperature; _{the mU of solution b) was} treated, changed

Manganese dioxide ¹ ^ _{in about 15} months the film to prevent

Iron oxide · · · ■ ··. ··· flowing rust in a black-brown oxide film

(Mixed iron oxide from Ferro-Fern- ^ _um

oxide and iron sesquioxide) on a surface treated with solution a)

^Toluo1 changed after about 18 months of the

b) Phthalic acid resin 40 film for preventing rust flowing into one

Manganese dioxide 1 dark brown oxide film around.

Lead oxide 20 ₅ “Also those treated with solutions b), c) and e)

Xylene ^residue samples show the same favorable results, though

. ",, 40 some differences were noted in the time

It ^ v '"λ 1 of the stable iron oxide films on the bottom of the

Mangandioxya ^ steel surfaces are formed, and in the

i itanoxya _{i 5j Sßbea def} ^^^^ iron oxide films.

Kuptersuma _R ^ _{The so erha} it _enes iron oxide films on the base

^Ayloi 's steel surfaces are all sturdy, compact films

d) Cyclic rubber * ~ and do not produce flowing rust even if they

Manganese dioxide 14 continue to be continuously exposed in the open air.

Iron oxide (as in a) ° 60 Therefore, there are no stains in the area at all

Hard rubber powder (25.4% S) can be determined 1 °. The corrosion of the steels is also great Xylene ^remainder low.

e) Kautsdrakcblorid 25 As will be explained in the preceding ^

Manganese dioxide ¹⁰ according to the invention the surface of a weatherproof

Copper oxide ² ^ 65 low-alloy steel of a special coating

LhV ^ piDii ^ yHiexyl ... 5 treated so that the penetration of Water on the grand of the StaMober thing first Rest minimum is restricted while penetration

is positively influenced by oxygen, which leads to the formation of iron oxide on the bottom of the steel surface under the film is accelerated during the life of the film, and beyond that the iron oxide is made a stable oxide by preventing the oxide pigment that is in the film of flowing rust is contained in which iron oxide is trapped, with the result that the formation is prevented from flowing rust, as it is at

conventional bare weatherproof low alloy steels can be seen.

As a result, stains appear in the vicinity of structures and scaffolding that are made of weatherproof Low-alloy steels are made, avoid the consumption of the steel material by corrosion is reduced, as a result of which the achievable service life of the steels can be greatly extended.

1 sheet of drawings

Claims (4)

flowing rust are caused, such as the consumption of the steel parts and the staining of the patent claims: environment and the like without the formation of flowing rust, as is usually the case with a conventional 1. Anti-rust coating agents for components and 5 borrowed processes is seen, and the goal is to be one To create scaffolding made of weather-resistant, low-alloy steel part for structures and scaffolding Temporary steel, the one! transforming assembly together a hard, compact protective rust on the and oxide pigment, thereby forming the surface of the steel without the characterized in that the oxide pigment above-mentioned formation of a flowing rust more than 30% and less than 70% of the coating 10 occurs. forms and contains more than 1% manganese dioxide. According to the invention, this aim can thereby be achieved 2. Anti-rust coating agent according to claim 1, that the surface of the weatherproof low thereby characterized in that all of the oxide alloy steel is coated with a film which pigment is manganese dioxide. from an oxide pigment, which is manganese dioxide 3. B-ostschutzüberzugsmittel according to claim 1, 15 includes and a film-forming component, characterized in that the oxide pigment, In this case, it is irrelevant whether the film on which the manganese dioxide is not made of one or more steel surface before or after the installation of the steel core of the compounds iron oxide, copper oxide, partly in a scaffold or a building.
Consists of titanium oxide and lead oxide. In the following the invention is exemplified 4. Rust protection coating agent according to one of the above ao hand of the drawing explained in more detail,
The previous claims, characterized in that it shows the change in the amount of iron that it contains 0.05 to 10% sulfur. from the surface of a sample during a test