a method for protection of high-temperature alloys containing iron, nickel and chrome against a high-temperature corrosion caused by METAL cementation or spraying

UKRAINE

(19) id (11) 58503 (13) C2

(51) 7 С23Р11 / 00, С23С30 / 00

MINISTRY OF EDUCATION SCIENCE OF UKRAINE

STATE DEPARTMENT OF INTELLECTUAL PROPERTY

DESCRIPTION

TO THE INVENTORY PATENT

(54) METHOD FOR PROTECTION OF HIGH-TEMPERATURE ALLOYS CONTAINING GRAIN, NICKEL, AND CHROME, FROM A HIGH-TEMPERATURE CORROSION INVOLVED BY CEMENT OR ORGANIZATION OF THE META-LU

(21) 98094899

(22) 17 091998

(24) 15 08 2003

(31) 60 / 059,538

(32) 19 09 1997

(33) from

(46) 15 08 2003, Bull No. 8, 2003

(72) Alstrup Ib, JC, Horkendorf Ib, JC

(73) HALDOR TOPSOYE A / S, JV

(56) ΕΕ 3329908 Α1, 03 05 1984

ΕΕ 3329907 Α1, 24 051984

CB 966589 Α, 12081964

Ρυ 2065505 С1.20 081996

ννο 91/02108 Α1, 21 021991

SN 646460 A5, 30 11 1984

Zi 457757 A, 05 031975

(57) 1 A method of protecting high-temperature alloys containing iron, nickel and chrome, from high-temperature corrosion caused by cementation or by spraying a metal, including treatment of a protected surface that differs in that the treatment is carried out by depositing a layer of at least one metal selected from the group

The present invention relates to a technology for the protection of high-temperature alloys, mainly for the protection of high-temperature alloys that contain iron, nickel and chromium, from high-temperature corrosion caused by cementation or meta-leak dusting

The main problem of many industrialprocesses is that high-temperature alloys, which are mainly used as building materials, are subject to oxidation-induced corrosion, or cementation, or metal curing when exposed to high-temperature high-carbon gases Cementation is observed in the petrochemical industry, where ethylene is produced in pyrophysical furnaces by the thermal splitting of hydrocarbons in a mixture of water vapor-hydrocarbon at temperatures up to

containing precious metals, precious metals, metals from group IV and group V of the Periodic Table and their mixture, with a thickness in the range of 0,01-jum per surface protected, and the subsequent firing of the processed surface in an inert atmosphere at a specified temperature

2 is a method according to claim 1, characterized in that the burn-out at a certain temperature is carried out for a period of time sufficient to achieve a homogeneous distribution of the metal on and on the protected surface

3 A method according to claim 1, characterized in that, as a metal of the group IV, Zn / or Pb

4 A method according to claim 1, characterized in that, as a metal of the group V, 5b i / or

5 A method according to any one of claims 1-4, which is characterized by the fact that before depositing a layer of the surface, I am protected, cleaned

6 A method according to any one of claims 1 to 5, which is distinguished by the fact that before depositing a layer of the surface, it is in danger of being subjected to polishing

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110СГС In this process of splitting on the inside walls of the pipes of the splitting group occurs coke-de precipitation. In steam converters, natural gas or other hydrocarbons are converted into the conditions of the catalytic reaction on nickel catalysts to CO and N. Cementation of the walls of the pipe is observed after overheating or excessive activity of carbon In industrial furnaces of a heat treatment or cementation of steels, in addition, there is the cementation of the lattice and the walls of the furnace. The glass elements of the nuclear reactor cooled by the COG can be boiled and cemented carbon dioxide, and heat exchangers of the cooled helium reactor can be cemented with impurities such as CO and CH₄ in helium Cementation is possible under the influence of coal gasification and waste incineration in the equipment, but more difficult will be sulfidization

WITH

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and corrosion under the influence of chlorine. At the steam reforming stove, thermal recovery equipment is potentially vulnerable to severe forms of corrosion, known as "metal spraying". This is a process of metastable cementation, to which vulnerable alloys containing iron, nickel and cobalt, the results of which are the breakdown of the alloy into " dust ", which consists of particles of carbon, carbides, metala and oxides. The result is the wear of the surface of the alloy. In contrast to the above-mentioned carburization, the meta-leve of dusting is caused by temperatures, not less than about 450 ° C. As a result t bug-toh studies concluded that faktych-but all alloys are exposed to high temperatures, a metal dusting yevrazlyvymy

A known method for the protection of high-temperature alloys containing iron, nickel and chromium, from the high temperature corrosion caused by cementation or metal spraying, which includes polishing and cleaning of the surface, mechanical treatment by a stream of sand and shot, and oxidation of the surface (see "Metallographic polishing me -channel methods ", print AZM, 3 Eb, 1982)

The known method does not guarantee sufficient protection of parts and components of industrial equipment from high-temperature alloys

It is an object of the invention to provide a highly effective method for the protection of high-temperature alloys containing iron, nickel and chromium, from high-temperature corrosion caused by cementation or metali dusting

This task is achieved by the proposed method of protecting high-temperature alloys containing iron, nickel and chromium, from high-temperature corrosion caused by cementation or meta-leak dusting, which includes the treatment of the protected surface, and the treatment carried out It melts by depositing a layer of at least one

metal selected from the group containing generous metals, precious metals, metals from the group IV and group V of the periodic table and their mixtures, with a thickness in the range of 0.01 to 1 Utm on the protected surface, followed by burning of the surface to be coated in an inert atmosphere of a detectable temperature

Burning with a certain temperature takes place for a period of time sufficient to achieve a homogeneous distribution of the metal on and on the protected surface

The precipitation of these metals may be nanosized by conventional methods, which include physical or chemical vapor deposition, or immersion, roiling, or galvanic coating

As the group IV metals, preferably Br2 or Pb are used. As Group V metals, it is preferable to use B1 or B1

Before depositing the layer, the protective layer can be cleaned with the following, if necessary, by polishing

This invention is illustrated by the following appendages that are intended to describe a method of performing and using the above-mentioned inventions in detail

A number of tests were carried out on the crown of the metal sawing using, as test pieces, cylindrical discs with a diameter of about 18 mm and a thickness of 6 mm, made from an alloy of 800 N, followed by the composition of attention,% 0.05-0 1 C, max 1 0 Зі, тай 1 5 Мп, тах0 015 3, 30 0-35 0 Nі, 20 0 Сг, 45 Ре, 015-0 6 Ті, 0 15-0 6 АI, тах 0 75 Сі

Example 1

Test specimens were investigated for corrosion of the metal tearing under the following conditions

Gas pressure

Composition of the gas mixture Gas velocityTemperaturePeriod of the experiment

34 bar

49 3% N₂, 15 6% CO, 5 0% CO₂, 29 5% H₂AT

max 10m / sec

650 ° C

200g

The research was carried out after the surface treatment and after a certain number of different standard preparations, including polishing and cleaning of the surface, mechanical treatment, and surface oxidation. The use of mechanical treatments is sandblasting and blasting. In all of these cases, after the test, severe corrosion from metal spraying, such as carbon formation , point corrosion, and material loss. However, when a test sample was prepared according to the present invention, after the above-described corrosion test of the meta evoho dusting on sub-

The prepared surface was not fixed signs of corrosion

The next preparation according to the invention was to polish and clean the surface. The PhysicalParolithic deposition on a protected surface was sprayed with a layer of gold in a thickness of about 1 μM. After this, the sample was maintained at 900 ° C for a volume of helium current

Example 2

The alloy of 800 N of the test sample from the above-mentioned composition was tested in the following conditions

Gas pressure

Composition of the gas mixture Gas velocityTemperaturePeriod of the experiment

34 bar

39.4% N₂, 37.2% CO, 1.7% CO₂, 21.7% H₂AT

max 10m / sec

653 ° C.

100g

Before the test was made the following

Tovka

The surface of the sample was polished and

zinc On the surface electrochemically

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5

A layer of tin was deposited in thickness, approximately, Znm. The specimen was aged at 8 CGS for 6 hours in a current of helium

6

After the corrosion test on the metal coating, no noticeable signs of corrosion were observed on the prepared surface.

ComputerWorldGaponenko Signed for print 05092003 Circulation 39 at m

Ministry of Education and Science of Ukraine

State Department of Intellectual Property, Lvivska square, 8, m Kyiv, SME, 04655, Ukraine

LLC "International Scientific Committee", Artema str, 77, Kyiv, 04050, Ukraine