PL228334B1 - Method for producing wear and corrosion resistant, multicomponent top coating on the aluminium and silicon casting alloys - Google Patents

Description

(12) PATENT DESCRIPTION ₍ i ₉₎ PL ₍ n) 228334 (13) B1 (21) Application Number: 416273 ( ⁵¹ ) IntCI.

C22C 21/02 (2006.01) C23C 14/48 (2006.01) C23C 8/36 (2006.01) (22) Date of notification: 25.02.2016 _C23C 8/10 (2006.01)

C23C 8/24 (2006.01) C23C 8/28 (2006.01) C23C 30/00 (2006.01)

A method of producing a multi-component surface layer resistant to abrasion and corrosion on aluminum and silicon alloys, especially in foundry alloys (73).

POLITECHNIKA GDAŃSKA, Gdańsk, PL (43) Application was announced:

28.08.2017 BUP 18/17 (45) The following was announced about the grant of the patent:

30/03/2018 WUP 03/18 (72) Inventor (s):

WALDEMAR SERBIŃSKI, Gdańsk, PL TADEUSZ WIERZCHOŃ, Warsaw, PL ANDRZEJ ZIELIŃSKI, Gdynia, PL (74) Plenipotentiary:

thing, pat. Czesław Popławski 'st what what what

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PL 228 334 B1

Description of the invention

The subject of the invention is a method of producing a multi-component surface layer resistant to abrasion and corrosion on aluminum-silicon alloys, especially in foundry alloys.

Metallic coatings produced on aluminum alloys by chemical or electrolytic methods in order to increase the abrasion resistance, for example nickel-based coatings and chrome coatings, are known. However, these coatings differ significantly in the coefficient of linear expansion from aluminum alloys and when working at elevated temperatures, they often peel off and fall off the substrate. The comparison of the known linear expansion coefficients shows that manganese coatings are the coatings with a linear expansion coefficient very similar to that of aluminum.

There is a known method of producing a manganese coating on an aluminum substrate by electrolytically applying this coating. Manganese coatings are characterized by high hardness and abrasion resistance, however, they are brittle and show a relatively high coefficient of sliding friction and significantly lower corrosion properties compared to the aluminum substrate.

The aim of the invention is to develop a method of producing manganese coatings with modified adhesive and tribological properties.

The method of producing a multi-component surface layer resistant to abrasion and corrosion on aluminum-silicon alloys, especially in foundry alloys, which consists in applying a manganese coating to the surface of the alloy, is characterized according to the invention in that the manganese coating, into which phosphorus ions are introduced by ion implantation with a dose in the range 1x10 ¹⁵ -5x10 ¹⁷ P ⁺ / cm ² using energy of 10-200 keV at room temperature to obtain a manganese-phosphor layer.

Preferably, the resulting manganese-phosphor layer is subjected to the glow discharge process in a glow discharge nitriding furnace at a temperature of 350-560 ° C in an atmosphere of 30-60% vol. nitrogen and 30-60 vol. hydrogen, at a pressure of 1.5-5.0 hPa, with an atmosphere output of 60 dm ³ / h, for a period of 3-6 hours, then the aluminum alloy with the resulting manganese-nitrogen-phosphorus layer is preferably cooled down in a vacuum at a temperature of 90-110 ° C.

Preferably, the aluminum alloy with the resulting manganese-phosphor layer is subjected to a glow-oxy-nitriding process in a glow-discharge oxygen-nitriding device at a temperature of 350-600 ° C in an atmosphere of 40-60 vol. Nitrogen, 40-60 vol.% hydrogen and with the addition of 10-20% vol. air, at a pressure of 2.0-5.0 hPa, with an atmosphere flow rate of 30-60 dm ³ / h, for a period of

3-6 hours to obtain a manganese-phosphorus-nitrogen-oxygen layer.

By using the method according to the invention, the abrasion and corrosion resistance of aluminum alloys is increased.

The invention is described in more detail in the examples of its implementation.

P r z k ł a d 1

Samples of casting aluminum alloys AlSi13Mg1CuNi and AISi10Cu2Mg1 lNi 1 were prepared.

A manganese coating was produced on the samples in a known electrolytic manner. Before implantation, the samples with manganese coating were washed in ethyl alcohol, and after drying, they were implanted with phosphorus ions.

Implantation with phosphorus ions (P +) was carried out at room temperature, with the dose of phosphorus ions x 10 ¹⁶ P + / cm ² , at an energy of 25 keV.

Aluminum alloy samples with a manganese-phosphor layer (Mn-P) were subjected to microhardness tests, and the test results are presented in Table 1, and corrosion tests, the results of which are presented in Table 2.

P r z k ł a d 2

Samples of AlSi13Mg1CuNi and AlSi10Cu2Mg1Ni1 aluminum alloys with electrolytically applied manganese coating were washed in ethyl alcohol, and after drying, they were placed in an ion implantation device. Phosphorus ions (P +) implantation was carried out at room temperature, with a dose of phosphorus ions of 3 x 10 ¹⁷ P + / cm ² , at an energy of 30 keV.

The samples with the manganese-phosphor layer applied were subjected to the glow discharge nitriding process. This process was carried out at a temperature of 480 ° C and time of 3 hours. The working atmosphere was a mixture of 50% nitrogen and 50% hydrogen. The working pressure in the device was 2.66 hPa with the flow of atmosphere (H2 + N2) 50 dm ³ / h. After the completion of this process, a manganese-phosphorus-nitrogen (Mn-PN) layer was obtained on the aluminum alloys, diffusively bonded to the aluminum substrate.

PL 228 334 Β1

The samples were subjected to microhardness tests, and the test results are presented in Table 1, and the corrosion tests, the results of which are presented in Table 2.

Example 3

The samples prepared according to example 1 were subjected to a glow discharge oxy-nitriding process. The process of glow discharge oxygen-nitriding was carried out in a working atmosphere consisting of (H2 + N2) in the proportion 1: 1 with the addition of 15% vol. air. The temperature of the glow discharge oxygen-nitriding process was 560 ° C, the pressure of the working atmosphere was 3.0 hPa, and the process was carried out for 5 hours.

During this process, the obtained layer was diffused with the aluminum substrate and the manganese-phosphorus-nitrogen-oxygen surface layer (Mn-P-N-O) was created.

The samples were subjected to microhardness tests, and the test results are presented in the table, and the corrosion tests, the results of which are presented in Table 2.

Table 1.

Microhardness of (Mn-P), (Mn-P-N) and (Mn-P-N-O) surface layers

Type layers Subsoil Microhardness HV0.02 Surface Zone subsurface (Mn-P) AlSil3MglCuNi 952 1272 (Mn-P-N) AlSiOMglCuNi 513 411 (Mn-P-N-O) AlSilOCu2MglNil 851 552

Table 2

Corrosion properties in 0.01 M H2SO4 in surface layers formed on AISi13Mg1CuNi and AISi10Cu2Mg1Ni1 alloys

Type layers Subsoil Potential E | tor [mV] Current density J _kor [μΑ / cm ² ] - AlSil3MglCuNi - 449.8 10.5796 - AlSilOCu2MglNil - 464.2 8.6843 (Mn-P) AlSil3MglCuNi - 1276.0 5.3214 (Mn-P-N) AlSil3MglCuNi -432.6 2.2616 (Mn-P-N-O) AlSilOCu2MglNil -516.5 0.7279

PL 228 334 B1

Claims (3)

Patent claims Method of producing a multi-component surface layer on aluminum-silicon alloys, especially foundry alloys, resistant to abrasion and corrosion, consisting in applying a manganese coating to the surface of the alloy, characterized in that phosphorus ions are implanted into the manganese coating by ion implantation with a dose ranging from 1x10 ¹⁵ -5x10 ¹⁷ P ⁺ / cm ² using energy of 10-200 keV at room temperature to obtain a manganese-phosphorus layer. 2. The method according to p. A process according to claim 1, characterized in that the aluminum alloy with the resulting manganese-phosphor layer is subjected to the glow discharge process in a glow discharge nitriding furnace at a temperature of 350-560 ° C in an atmosphere of 30-60 vol. nitrogen and 30-60 vol. hydrogen, at a pressure of 1.5-5.0 hPa, with an atmosphere flow rate of 30-60 dm ³ / h, for a period of 3-6 hours, after which the obtained aluminum alloy with a manganese-nitrogen-phosphorus layer is preferably cooled down in a vacuum at a temperature of 90 -110 ° C. 3. The method according to p. The method of claim 1, characterized in that the aluminum alloy with the obtained manganese-phosphor layer is subjected to a glow-oxy-nitriding process in a glow-discharge oxygen nitriding device at a temperature of 350-600 ° C in an atmosphere of 40-60 vol. Nitrogen, 40-60 vol.% hydrogen and with the addition of 10-20% vol. air, at a pressure of 2.0-5.0 hPa, with an atmosphere flow rate of 30-60 dm ³ / h, for a period of 3-6 hours until a manganese-phosphorus-nitrogen-oxygen layer is obtained.