WO2015020557A1 - Composition de mélange en poudre pour le zingage par thermo-diffusion d'articles en alliages d'aluminium, et procédé de zingage par thermo-diffusion d'articles en alliages d'aluminium - Google Patents

Composition de mélange en poudre pour le zingage par thermo-diffusion d'articles en alliages d'aluminium, et procédé de zingage par thermo-diffusion d'articles en alliages d'aluminium Download PDF

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WO2015020557A1
WO2015020557A1 PCT/RU2013/000696 RU2013000696W WO2015020557A1 WO 2015020557 A1 WO2015020557 A1 WO 2015020557A1 RU 2013000696 W RU2013000696 W RU 2013000696W WO 2015020557 A1 WO2015020557 A1 WO 2015020557A1
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container
zinc
products
powder mixture
saturating
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PCT/RU2013/000696
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English (en)
Russian (ru)
Inventor
Владимир Анатольевич ГУРЬЕВ
Владимир Фёдорович ФОМИН
Любовь Ивановна ПАХОМОВА
Лешек САВИЦКИ
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Gur Ev Vladimir Anatol Evich
Fomin Vladimir Fjodorovich
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Application filed by Gur Ev Vladimir Anatol Evich, Fomin Vladimir Fjodorovich filed Critical Gur Ev Vladimir Anatol Evich
Priority to PCT/RU2013/000696 priority Critical patent/WO2015020557A1/fr
Priority to EP13874224.2A priority patent/EP2966191A4/fr
Priority to RU2014125890/02A priority patent/RU2559391C1/ru
Publication of WO2015020557A1 publication Critical patent/WO2015020557A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
    • C23C10/28—Solid state diffusion of only metal elements or silicon into metallic material surfaces using solids, e.g. powders, pastes
    • C23C10/34—Embedding in a powder mixture, i.e. pack cementation
    • C23C10/36—Embedding in a powder mixture, i.e. pack cementation only one element being diffused

Definitions

  • composition of the powder mixture for thermal diffusion galvanizing of products from aluminum alloys the method of thermal diffusion galvanizing of products from aluminum alloys
  • the invention relates to a process of thermal diffusion galvanizing of products from aluminum alloys and can be used in all industries: mechanical engineering, automobile- shipbuilding and aircraft manufacturing, chemical and construction equipment, where parts, machine parts and products from aluminum alloys work in aggressive environments and are subject to various kind of corrosion damage.
  • the main material of powder mixtures for thermal diffusion galvanizing of iron-carbon steels and alloys is zinc powder and an activator (for example, ammonium chloride).
  • compositions of powder mixtures obtained by mixing zinc powder or zinc dust (pulsers) in an amount of up to 75 wt.%, An inert filler, which is used alumina in an amount of up to 23 wt.%, And an activator, which is used as ammonium chloride in an amount up to 2 wt.% to the mass of the pulser.
  • Pulsers zinc powder or zinc dust
  • an inert filler which is used alumina in an amount of up to 23 wt.%
  • an activator which is used as ammonium chloride in an amount up to 2 wt.% to the mass of the pulser.
  • a known composition for producing a diffusion coating comprising a zinc-containing substance, aluminum, ammonium chloride and an inert filler, in which to increase the corrosion resistance of the coating and reduce gas evolution, magnesium and carnallite are additionally introduced, and heartsink is added as a zinc-containing substance [SU 1521790, published 15.1 1.1989] .
  • a known composition of the powder mixture for thermal diffusion galvanizing including an inert filler alumina - electrocorundum or silicon oxide with a grain size of not more than 0.2 mm in an amount of 50.0 to 99.0 wt.%, Zinc powder containing not less than 90.0 wt. % fractions up to 0.16 mm in size 0.6 - 40.0 wt.%, and as an activator - ammonium chloride in an amount of 0.4 - 10 wt.%. [RU 2180018, published 02.27.2002].
  • the disadvantage of the above galvanizing compositions is the possibility of their use only for anti-corrosion treatment of products from carbon and low alloy, including high strength, steel, cast iron, copper. These mixtures cannot be used for anticorrosion treatment of products from aluminum alloys due to the absence or insufficient chemical activity of the used activator and inert filler, the presence of which does not allow the destruction of the oxide film, as well as the subsequent protection of the surface of products from aluminum alloys from its formation, especially during high-temperature processing, which is in this case a necessary condition for the galvanizing process.
  • compositions of powder mixtures according to copyright certificates SU 1571 103, SU 1521790 are quite complex and time-consuming to prepare.
  • a known method of thermal diffusion galvanizing of steel wire in the temperature range 400-600 ° C including laying the wire in a container, followed by loading it into the furnace.
  • the method is carried out under the conditions of a stepwise, mainly three-stage, lowering of the process temperature in the indicated interval in the presence of excess pressure in the container.
  • An overpressure of 0.2-0.6 atm is maintained inside the container. [RU 2195512, published December 27, 2002]
  • a known method of thermal diffusion galvanizing [RU 2147046, published 17.08.1998] consisting in the fact that in a sealed rotating reactor load steel parts and a saturable mixture consisting of an inert material and zinc powder is heated and maintained at 390-430 ° C in an inert atmosphere. Highly dispersed zinc powder with a particle size of 4-60 microns is loaded in an amount of 0.10-0.20 kg per 1 m 2 of the coated surface of steel parts. An inert carrier is loaded into the reactor from 40 to 100 wt.% To the weight of the parts. An inert carrier is used with a particle size of 60-140 microns.
  • a disadvantage of the known methods is the possibility of their use for the formation of high-quality zinc diffusion coatings only on products made of steel, cast iron, copper. These methods cannot be used for anticorrosion treatment of products from aluminum alloys, since in this case uneven in thickness, discontinuous, rough, porous zinc coatings with an unacceptable amount of various kinds of defects are formed.
  • the closest composition and method of galvanizing products from aluminum alloys is described in Chinese patent N ° 102002665, publ. 10/03/2012.
  • the specified composition includes in% weight: zinc powder 14.9 - 84.5, inert metal oxide powder (mixture of Si0 2 and A1 2 Oz) 14.5 - 84.9, activating component (ammonium chloride or ammonium nitrate) 0, 1 -0.5 and an auxiliary component (NH 4 NH 2 S0 3 ) 0.1-0.5, while the galvanizing method involves loading aluminum alloy products into a sealed steel container and the above saturating powder composition, galvanizing at a temperature of 400 ⁇ 10 ° C for 60-180 minutes, cooling to room temperature and passivation.
  • this composition uses a different percentage composition of the powder mixture with the components of the activator (ammonium chloride) and inert filler (silicon oxide or alumina) traditionally used for thermodiffusion galvanizing of iron-carbon steels and alloys, see. , for example, a Russian patent [RU 2180018, 2012].
  • the activator ammonium chloride
  • inert filler silicon oxide or alumina
  • the introduction of the additional component N ⁇ Nt ⁇ SC into the powder mixture slightly increases the activity of the powder mixture, and serves mainly to increase the frequency of its use by reducing the clumping, refining (cleaning) and prevention of possible fire.
  • the specified method includes standard galvanizing operations, which cannot provide high-quality coatings on products from aluminum alloys, namely: placement of prepared products from aluminum alloy in a sealed steel container, heating the container to temperature 400 ⁇ 1 ° ⁇ for 60-180 minutes and cooling to room temperature.
  • the objective of the invention is to develop a composition of a powder mixture for thermal diffusion galvanizing of products from aluminum alloys and a method of thermal diffusion galvanizing of products from aluminum alloys in order to obtain high-quality corrosion-resistant diffusion zinc coating on products from a wide class of aluminum alloys and reduce the cost of the process due to the cheapening of the used powder mixture , i.e. reduction in the number of expensive components - zinc powder and activator.
  • the proposed method can also be used for thermal diffusion galvanizing of steel, cast iron and copper products in order to increase their corrosion resistance.
  • the technical result of the invention is that as a result of the use of this powder mixture for thermal diffusion galvanizing and the method of thermal diffusion galvanizing, mainly products from aluminum alloys get uniform in thickness (60-65 microns), solid, defect-free corrosion-resistant (corrosion resistance in the chamber neutral salt fog for at least 720 hours) diffusion zinc coatings on products from a wide class of aluminum alloys; a reduction in the cost of the process due to cheaper costs is achieved used powder mixture, as a result of reducing the number of expensive components - zinc powder and activator.
  • composition of the powder mixture for thermal diffusion galvanizing of products from aluminum alloys including zinc powder, an inert filler and an activator, and as an activator use a mixture of the following components, in wt.%: Sodium fluoride 12-15, lithium chloride 20-25 , ammonium chloride 10-15, zinc chloride 12-14, potassium chloride - the rest, in the following ratio of components of the composition, in wt.%:
  • a PCR-1 powder is used (zinc powder obtained by spraying a zinc melt with an inert gas), produced on an industrial scale, having the following composition, wt.%: Fractions less than 63 microns - not less than 50.0; fraction 63-160 microns - not more than 40.0; fraction more than 160 microns - not more than 10.0.
  • the content of zinc metal is at least 98 wt.% According to GOST 12601-76.
  • Zinc powder of the PTsR-1 brand in accordance with GOST 12601-76 is widely used for thermal diffusion galvanizing of iron-carbon steels and alloys, cast iron and copper as a part of powder mixtures, including, if necessary, various activators and inert fillers.
  • an inert filler a strong, porous, refractory material of organogenic origin is used, consisting of oxides: silicon, aluminum, iron, calcium, as well as clay and sand impurities, for example, diatomite, flask, tripoli and others, with a density of 0.7-1 , 0 g / cm, which are adsorbent, catalyst and ballast.
  • at least 80.0 wt.% Inert filler is used with a particle size of 0.8-1.2 mm, up to 20.0 wt.% Inert filler can be used with a fraction size of less than 0.8 mm.
  • the proposed inert filler in comparison with the known inert fillers, for example, aluminum oxide (electrocorundum) or silicon oxide used in the prototype, is characterized by increased adsorption and catalytic properties, which significantly intensifies the process of saturation of the crystal lattice of aluminum alloys with zinc.
  • the adsorption capacity of the inert filler is ensured by its low density and high porosity. It is at such a density that the necessary saturation of the inert filler with zinc can be obtained from the gas and solid phases.
  • High strength and the selected particle size provide reliable destruction of the oxide film on the surface of aluminum alloys, as well as a double effect during thermal diffusion galvanizing, namely: chemical-thermal (saturation of the surface of the aluminum alloy from the gas phase) and mechanical - from the solid phase (in direct contact of the powder zinc and inert filler with an aluminum alloy surface).
  • a mixture is used, consisting of the following components, in wt.%: Sodium fluoride NaF - 12-15, lithium chloride LiCl - 20-25, ammonium chloride NH 4 C1 - 12-15, zinc chloride ZnCl 2 - 12-14 , potassium chloride KC1 - the rest.
  • potassium chloride KC1 and sodium fluoride NaF increase the thermal diffusion activity of zinc, promote the dissolution of aluminum and zinc oxides
  • lithium chloride LiCl helps to accelerate the diffusion process by increasing the thermodynamic activity of zinc, increases the density and corrosion resistance of zinc coatings, dissolves aluminum and zinc oxides
  • ammonium chloride NH 4 C1 helps to create a protective atmosphere in the furnace, accelerate the galvanizing reaction due to the active mixing of the reacting materials, increase the density of the zinc coating
  • Zinc chloride ZnCl 2 helps to accelerate the diffusion of zinc by increasing its thermodynamic activity, dissolving aluminum and zinc oxides, and reducing zinc.
  • the content of chemically active components in the activator provides reliable protection of the surface of the aluminum alloy from the formation of an oxide film at high galvanizing temperatures, thereby, together with the proposed inert filler, provides the formation of high-quality, corrosion-resistant zinc coatings.
  • the claimed technical result is achieved by the method of thermal diffusion galvanizing of products from aluminum alloys, including pre-treatment of the surface of products with a shot with a dispersion of 0.3-0.4 mm from austenitic or austenitic-ferritic steel, loading of products and a saturating mixture into a container preheated to 100-120 ° C, loading the container into a preheated to 100-120 ° C furnace, processing of products at a temperature of 420-430 ° C for 1 hour with constant rotation of the container at a speed of 1-2 rpm and a constant pressure inside the container of 1.8-2.2 atm, cooling the furnace to 100-120 ° C , removing products from a container, cooling products in water and their processing running in a vibration installation with ceramic chips with a passivating solution until the layer of deposited zinc powder is completely removed from the surface of the products, while the potential difference between the surface of the aluminum alloy and the obtained diffusion zinc layer is determined by the condition:
  • ⁇ ⁇ is the electrode potential difference (in volts)
  • ⁇ ⁇ ⁇ is the electrode potential of an aluminum alloy
  • ⁇ ⁇ is the electrode potential of the diffusion zinc layer
  • a composition including zinc powder, an inert filler and activator is used, and as activator use a mixture of the following components, in wt.%: sodium fluoride 12-15, lithium chloride 20-25, ammonium chloride 10-15, zinc chloride 12-14, potassium chloride - the rest, in the following ratio of components of the composition, in wt.% :
  • Zinc powder the rest. Constant pressure inside the container creates active gaseous substances released from the saturating powder mixture when heated.
  • the need for preliminary surface treatment of products from aluminum alloys with shots with a dispersion of 0.3-0.4 mm from austenitic or austenitic-ferritic steel is due to several factors.
  • the use of a fraction with a dispersion of 0.3-0.4 mm allows you to destroy a strong oxide film on products made of aluminum alloys and to form an oxide film of austenitic or austenitic-ferritic steel, which is easily destroyed by the powder mixture and the active gaseous substances (volatile) released from it. chemical compounds) during heating during thermal diffusion galvanizing.
  • the used powdered mixture and the active gaseous substances (volatile chemical compounds) released from it during heating do not allow the oxide film to be restored again on the surface of aluminum alloy products in the process of thermal diffusion galvanizing.
  • fractions with a fineness of less than 0.3 mm does not allow the oxide film to be destroyed on the surface of aluminum alloy products due to its insufficient mass and impact energy.
  • fractions with a fineness of more than 0.4 mm a significant increase in the surface roughness of the processed products from aluminum alloy occurs.
  • the need to load aluminum alloy products and a saturating powder mixture into a container preheated to a temperature of 100-120 ° C is due to the fact that the saturating powder mixture is characterized by high hygroscopicity. Preheating the container to the specified temperature can significantly reduce the moisture concentration in it, and hence in the saturating powder mixture.
  • the need to load the container into a furnace preheated to 100-120 ° C is due to the prevention of container cooling, and, therefore, the possibility of saturation of the saturating powder mixture with moisture.
  • the container can cool, which means an increase in moisture concentration in it and in the saturating powder mixture, which leads to its clumping, which means that during thermal diffusion galvanizing, the full contact of the saturating powder mixture with the surface of aluminum products will not be observed.
  • alloy which is accompanied by a deterioration in the quality of the zinc coating.
  • Preheating the furnace to a temperature of more than 120 ° C is economically and technologically impractical.
  • the layer of deposited zinc powder on the surface of aluminum alloy products is characterized by a significant potential difference with the aluminum alloy, as well as with the diffusion zinc layer.
  • numerous comprehensive studies have established that the layer of deposited zinc powder is characterized by a more positive value of the electrode potential compared to the electrode potential of the diffusion zinc layer and aluminum alloy, which means that it is an oxidizing agent in relation to them, which can adversely affect the corrosion properties of the product.
  • a corrosion-resistant strong film is formed on the surface of the diffusion zinc layer due to the processing of the product in a passivating solution.
  • the thickness of the zinc coating was determined by metallographic method on transverse microsections with using an MMP-4 microscope, microsections were etched in a 1% hydrofluoric acid solution.
  • the method of thermal diffusion galvanizing is as follows. Products made from AMgb aluminum alloy (GOST4784-74) are pretreated with a shot with a fineness of 0.3-0.4 mm from 12Kh18N10T austenitic steel to completely remove the strong oxide film of the aluminum alloy and form an oxide film of austenitic steel.
  • the loading of products and a saturating powder mixture is carried out in a container preheated to a temperature of 100-120 ° C.
  • a saturating powder mixture of the above composition is used, capable of releasing active gaseous substances (volatile chemical compounds) at the galvanizing temperature.
  • the container is sealed and loaded into a furnace preheated to 100-120 ° C.
  • thermal diffusion galvanizing is carried out at a temperature of 420-430 ° C for 1 hour with constant rotation of the container at a speed of 1-2 rpm
  • Thermal diffusion galvanizing is carried out at a constant pressure of 1.8-2.2 atm inside the container, created by active gaseous substances (volatile chemical compounds) released from the saturating powder mixture when heated.
  • the furnace is cooled to a temperature of 100-120 ° C
  • the container is removed from the furnace, the products are removed from the container and cooled in water to clear the saturable powder mixture adhering to the surface.
  • the samples are processed in a vibration installation with ceramic chips with a passivating solution for complete removing from their surface a layer of deposited zinc until the condition:
  • FIG. 1 shows a General view of the zinc coating formed during the implementation of the proposed method.
  • FIG. 2 shows the temperature parameters of the proposed method of thermal diffusion galvanizing of products from aluminum alloys.
  • FIG. 3 shows the technological operations in the implementation of the proposed method of thermal diffusion galvanizing products from aluminum alloys. 1 - shot blasting the product, 2 - loading the product and the saturating powder mixture into the container, 3 - loading the container into the furnace and conducting thermal diffusion galvanizing, 4 - unloading the container from the furnace, 5 - unloading the products from the container, 6 - cooling the products in water; 7 - processing of the product in chips with a passivating solution.
  • Samples made of AMgb aluminum alloy (GOST4784-74) are pretreated with a fineness of less than 0.3 mm from austenitic steel 12X18H10T.
  • the loading of samples and a saturating powder mixture is carried out in a container preheated to a temperature of 100-120 ° C.
  • a saturating powder mixture consisting of zinc powder, an activator and an inert filler in the following ratio, wt.%:
  • the container is sealed and loaded into a furnace preheated to 100-120 ° C.
  • the process of thermal diffusion galvanizing is carried out at a temperature of 420-430 ° C for 1 hour with constant rotation of the container at a speed of 1-2 rpm
  • Thermal diffusion galvanizing is carried out at a constant pressure of 1.8-2.2 atm inside the container, created by active gaseous substances (volatile chemical compounds) released from the saturating powder mixture when heated.
  • the container After cooling the furnace to a temperature of 100-120 ° C, the container is removed from the furnace, the samples are taken out of the container and cooled in water to remove any saturating powder mixture adhering to the surface.
  • ⁇ ⁇ is the electrode potential difference (B), ⁇ ⁇
  • the characteristics of the resulting coating are shown in table 1.
  • Samples made of AMgb aluminum alloy are pretreated with a shot with a fineness of more than 0.4 mm from austenitic steel 12X18H10T.
  • the loading of the samples and the saturating powder mixture into the container is carried out analogously to example 1.
  • the qualitative and quantitative composition of the saturating powder mixture is similar to example 1.
  • the temperature of thermal diffusion galvanizing is similar to example 1.
  • the temperature of the furnace before cooling the samples in water is similar to example 1.
  • Processing of samples in a vibrating unit Application ceramic chips with a passivating solution is similar to Example 1. The characteristics of the obtained coating are shown in Table 1.
  • Example 3 (Best embodiment of the invention) Samples made of aluminum alloy AMGB
  • the loading of samples and a saturating powder mixture is carried out in a container preheated to a temperature of 100-120 ° C.
  • a saturating powder mixture consisting of zinc powder, an activator and an inert filler in the following ratio, wt.%:
  • Zinc powder rest capable of releasing active gaseous substances (volatile chemical compounds) at a galvanizing temperature.
  • the container is sealed and loaded into a furnace preheated to 100-120 ° C.
  • thermal diffusion galvanizing is carried out at a temperature of 420-430 ° C for 1 hour with constant rotation of the container at a speed of 1-2 rpm
  • Thermal diffusion galvanizing is carried out at a constant pressure of 1.8-2.2 atm inside the container, created by active gaseous substances (volatile chemical compounds) released from the saturating powder mixture when heated.
  • the container After cooling the furnace to a temperature of 100-120 ° C, the container is removed from the furnace, the samples are taken out of the container and cooled in water to remove any saturating powder mixture adhering to the surfaces.
  • Shot blasting of samples is similar to example 3.
  • the loading of samples and a saturating powder mixture is carried out in a container preheated to a temperature of less than 100 ° C.
  • the quantitative and qualitative composition of the saturating powder mixture is similar to example 3.
  • the temperature of the furnace when loading the container is similar to example 3.
  • Example 3 The temperature of thermal diffusion galvanizing is similar to Example 3.
  • the temperature of the furnace before cooling the samples in water is similar to Example 3.
  • the processing of samples after thermal diffusion galvanizing in a vibroinstallation with ceramic chips is similar to Example 3.
  • the characteristics of the resulting coating are shown in Table 2.
  • Shot blasting of samples is similar to example 3.
  • the loading of samples and a saturating powder mixture is carried out in a container previously heated to a temperature of more than 120 ° C.
  • the quantitative and qualitative composition of the saturating powder mixture is similar to Example 3.
  • the temperature of the furnace when loading the container is similar to Example 3.
  • the temperature of the thermal diffusion galvanizing is similar to Example 3.
  • Example 6 (comparative)
  • Shot blasting of samples is similar to example 3.
  • the temperature of the container when loading samples and a saturating powder mixture is similar to example 3.
  • Example 3 The temperature of the furnace when loading the container is similar to Example 3.
  • the temperature of thermal diffusion galvanizing is similar to Example 3.
  • the pressure inside the container created by active gaseous substances (volatile chemical compounds) released from the saturating powder mixture when heated is similar to Example 3.
  • Example 3 The temperature of the furnace before cooling the samples in water is similar to Example 3.
  • the processing of samples after thermal diffusion galvanizing in a vibration unit with ceramic chips is similar to Example 3.
  • the characteristics of the resulting coating are shown in table 3.
  • the temperature of the container when loading samples and a saturating powder mixture is similar to example 3.
  • a saturating powder mixture consisting of zinc powder, activator and inert filler in the following ratio, wt.%:
  • Example 3 The oven temperature when loading the container is similar to Example 3.
  • the temperature of thermo-diffusion galvanizing is similar to Example 3.
  • the pressure inside the container created by active gaseous substances (volatile chemical compounds) released from the saturating powder mixture when heated is similar to Example 3.
  • Example 3 The temperature of the furnace before cooling the samples in water is similar to Example 3.
  • the processing of samples after thermal diffusion galvanizing in a vibration unit with ceramic chips is similar to Example 3.
  • the characteristics of the resulting coating are shown in table 3.
  • Shot blasting of samples is similar to example 3.
  • the temperature of the container when loading samples and a saturating powder mixture is similar to example 3.
  • the quantitative and qualitative composition of the saturating powder mixture is similar to example 3.
  • the container is loaded into the furnace at a temperature of less than 100 ° C.
  • the temperature of thermal diffusion galvanizing is similar to example 3.
  • Temperature the furnace before cooling the samples in water is similar to example 3.
  • the processing of samples after thermal diffusion galvanizing in a vibration unit with ceramic chips is similar to example 3.
  • the characteristics of the resulting coating are shown in table 4.
  • Shot blasting of samples is similar to Example 3.
  • the temperature of the container when loading samples and a saturating powder mixture is similar to Example 3.
  • the quantitative and qualitative composition of the saturating powder mixture is similar to Example 3.
  • the container is loaded into the furnace at a temperature of more than 120.
  • the temperature of the diffusion galvanizing is similar to Example 3.
  • the furnace temperature before cooling in water samples is similar to example 3.
  • Treatment of the samples after the thermal diffusion into the galvanizing vibratory ceramic chips similar to Example 3. Characteristics of the obtained coating are shown in Table 4
  • Shot blasting of samples is similar to example 3.
  • the temperature of the container when loading samples and a saturating powder mixture is similar to example 3.
  • the quantitative and qualitative composition of the saturating powder mixture is similar to example 3.
  • the temperature of the furnace when loading the container is similar to example 3.
  • the temperature of thermal diffusion galvanizing similar to example 3. Thermal diffusion galvanizing is carried out at a pressure of less than 1.8 atm created by active gaseous substances (volatile chemical compounds) released from the saturating powder mixture when heated.
  • Example 3 The temperature of the furnace before cooling the samples in water is similar to Example 3.
  • the processing of samples after thermal diffusion galvanizing in a vibration unit with ceramic chips is similar to Example 3.
  • the characteristics of the resulting coating are shown in table 5.
  • Shot blasting of samples is similar to Example 3.
  • the temperature of the container when loading samples and a saturating powder mixture is similar to Example 3.
  • the quantitative and qualitative composition of a saturating powder mixture is similar to Example 3.
  • the temperature of the furnace when loading a container is similar to Example 3.
  • the temperature of diffusion galvanizing is similar to Example 3.
  • Thermodiffusion galvanizing is carried out at a pressure of more than 2.2 atm created by active gaseous substances (volatile chemical compounds) released from n a desiccant powder mixture when heated.
  • the oven temperature before cooling the samples in water is similar to Example 3.
  • the processing of samples after thermal diffusion galvanizing in a vibroinstallation with ceramic chips is similar to Example 3.
  • the characteristics of the resulting coating are shown in table 5.
  • Example 12 comparativative
  • Shot blasting of samples is similar to example 3.
  • the temperature of the container when loading samples and a saturating powder mixture is similar to example 3.
  • the quantitative and qualitative composition of the saturating powder mixture is similar to example 3.
  • the temperature of the furnace when loading the container is similar to example 3.
  • the processing of samples after thermal diffusion galvanizing in a vibration installation with ceramic chips is similar to example 3.
  • the characteristics of the resulting coating are shown in table 6.
  • Shot blasting of samples is similar to Example 3.
  • the temperature of the container when loading samples and a saturating powder mixture is similar to Example 3.
  • the quantitative and qualitative composition of the saturating powder mixture is similar to Example 3.
  • the temperature of the furnace when loading the container is similar to Example 3.
  • the temperature of the diffusion galvanizing is similar to Example 3.
  • the pressure inside the container created by active gaseous substances (volatile chemical compounds) released from the saturating powder mixture upon heating, and tax example 3.
  • the temperature of the furnace before cooling the samples in water more than 120 ° C.
  • Sample processing after thermal diffusion galvanizing in a vibroinstallation ceramic chips similar to example 3. The characteristics of the resulting coating are shown in table 6.
  • Example 3 The temperature of the container when loading the samples and the saturating powder mixture is similar to Example 3.
  • the quantitative and qualitative composition of the saturating powder mixture is similar to Example 3.
  • the temperature of the furnace when loading the container is similar to Example 3.
  • the temperature of the furnace before cooling the samples in water is similar to example 3. Processing samples after The diffusion galvanizing in a vibroinstallation with ceramic chips was carried out until a layer of deposited zinc powder was partially removed from their surface. The characteristics of the resulting coating are shown in table 7.
  • Example 15 comparativative according to the Chinese patent d 102002665.03.10.2012
  • Pre-fat-free samples made of AMgb aluminum alloy (GOST 4784-74) are loaded into the container.
  • the preparation of the powder mixture, its composition, the ratio of the components by wt.%, The fraction size of the components and the modes of thermal diffusion galvanizing were carried out according to the method according to Chinese patent JTsi 02002665, 03.10.2012.
  • the characteristics of the obtained zinc coating are shown in table 8.
  • the proposed composition of the powder mixture and the method of thermal diffusion galvanizing allow thermal diffusion galvanizing of products from aluminum alloys, to increase the efficiency of the process by reducing the cost of the saturating powder mixture, namely, reducing the number of expensive components included in it - zinc powder (table 1, example 3) .
  • table 1 (examples 1 and 2)
  • the prototype method does not solve the problem of the invention and does not allows you to achieve the desired technical result, and therefore cannot be used for corrosion protection of products from aluminum alloys.
  • the proposed method allows thermal diffusion galvanizing of products from aluminum alloys, increasing the efficiency of the process by reducing the cost of the saturating powder mixture, namely, reducing the number of expensive components included in it - zinc powder and activator.

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  • Other Surface Treatments For Metallic Materials (AREA)

Abstract

L'invention se rapporte au domaine du traitement chimique et thermique d'articles en alliages d'aluminium par zingage par thermo-diffusion. La composition de ce mélange de poudre comprend de la poudre de zinc, une matière de charge inerte comme des oxydes de silicium, d'aluminium, de fer, de calcium et des impuretés d'argile et de sable, et en un activateur consistant en un mélange des composants suivants en % en poids : fluorure de sodium 12-15, chlorure de lithium 20-25, chlorure d'ammonium 10-15, chlorure de zinc 12-14, le reste se composant de chlorure de potassium ; les composants de la composition sont présents dans les quantités suivantes en % en poids :matière de charge inerte 55-60 ; activateur 3-5 ; le reste se composant de poudre de zinc. Le procédé consiste à traiter au préalable la surface des articles avec de la grenaille selon une dispersion de 0,3-0,4 mm en acier austénitique ou austénitique-ferrite, et charger les articles et le mélange de saturation dans un conteneur préalablement chauffé à 100-120°C, à charger le conteneur dans un four préalablement chauffé à 100-120°C, à traiter les articles à une température de 420-430°C pendant 1 heure en faisant continuellement tourner le conteneur à une vitesse de 1-2 tours/min et à une pression constante de 1,8-2,2 atm dans le conteneur, à refroidir le four à 100-120°C, à extraire les articles du conteneur, à refroidir les articles avec de l'eau et les traiter dans une installation vibrante avec des copeaux céramiques et une solution de passivation, le mélange en poudre de saturation étant ladite composition.
PCT/RU2013/000696 2013-08-09 2013-08-09 Composition de mélange en poudre pour le zingage par thermo-diffusion d'articles en alliages d'aluminium, et procédé de zingage par thermo-diffusion d'articles en alliages d'aluminium WO2015020557A1 (fr)

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PCT/RU2013/000696 WO2015020557A1 (fr) 2013-08-09 2013-08-09 Composition de mélange en poudre pour le zingage par thermo-diffusion d'articles en alliages d'aluminium, et procédé de zingage par thermo-diffusion d'articles en alliages d'aluminium
EP13874224.2A EP2966191A4 (fr) 2013-08-09 2013-08-09 Composition de mélange en poudre pour le zingage par thermo-diffusion d'articles en alliages d'aluminium, et procédé de zingage par thermo-diffusion d'articles en alliages d'aluminium
RU2014125890/02A RU2559391C1 (ru) 2013-08-09 2013-08-09 Состав порошковой смеси для термодиффузионного цинкования изделий из алюминиевых сплавов, способ термодиффузионного цинкования изделий из алюминиевых сплавов

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CN111020473A (zh) * 2019-12-23 2020-04-17 南宁普来得工贸有限公司 新型粉末渗锌剂
CN111020470A (zh) * 2019-12-23 2020-04-17 南宁普来得工贸有限公司 低成本的粉末渗锌工艺
CN111020472A (zh) * 2019-12-23 2020-04-17 南宁普来得工贸有限公司 利用粉末渗锌技术制备的钢铁制件
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CN111020473A (zh) * 2019-12-23 2020-04-17 南宁普来得工贸有限公司 新型粉末渗锌剂
CN111020470A (zh) * 2019-12-23 2020-04-17 南宁普来得工贸有限公司 低成本的粉末渗锌工艺
CN111020472A (zh) * 2019-12-23 2020-04-17 南宁普来得工贸有限公司 利用粉末渗锌技术制备的钢铁制件
CN111041410A (zh) * 2019-12-23 2020-04-21 南宁普来得工贸有限公司 结合强度高、耐磨的粉末渗锌制件
CN111118442A (zh) * 2019-12-23 2020-05-08 南宁普来得工贸有限公司 渗锌速度快的粉末渗锌剂的使用方法
CN111962017A (zh) * 2020-08-25 2020-11-20 四川轻化工大学 一种在镁合金表面制备高硬度金属层的方法
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