Corrosion-resistant alloy coating film for metal materials and method for forming same

a coating film and alloy technology, applied in the direction of electrochemical generators, liquid/solution decomposition chemical coatings, transportation and packaging, etc., can solve the problems of high cost of materials, general inferior anti-corrosion effect, and difficulty in processing, so as to reduce the discharge of industrial waste and significant economic benefits

Inactive Publication Date: 2015-07-16
NIHON PARKERIZING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a method for coating materials with a highly corrosion-resistant alloy, which can modify the surface of inexpensive materials. This results in economic benefits, as the materials are less likely to be damaged or replaced due to corrosion or high-temperature oxidation. It also reduces industrial waste as the materials discharge less.

Problems solved by technology

However, these materials are all extremely expensive, and have problems such as difficulty with processing.
However, the anti-corrosion effect is generally inferior to those of austenitic stainless steels or Ni base alloys, and furthermore, rapid progress of replacement by non-chromate agents has been triggered by recent environmental regulations.
This is a production method in which when iron and steel materials are subjected to acid Zn—Co electroplating, the cobalt in an acid plating bath is adjusted to a concentration of 30 to 85 mol % with respect to zinc+cobalt so that the cobalt content in the plating film is 2 to 30 wt %, while the surface treatment film formed is not adequate in terms of acid resistance and oxidation resistance.
However, materials formed by this method have long-term inadequate corrosion resistance under strong acid.
However, there is a possibility that the surface treatment film formed by this method will be easily etched in a special mixed acid solution containing hydrofluoric acid.
Therefore, there are currently no inexpensive materials that excellent in corrosion resistance, oxidation resistance, and workability for materials and components for use under corrosive environments, in particular, under strong acid, and the development of novel materials has been desired.

Method used

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  • Corrosion-resistant alloy coating film for metal materials and method for forming same
  • Corrosion-resistant alloy coating film for metal materials and method for forming same
  • Corrosion-resistant alloy coating film for metal materials and method for forming same

Examples

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Effect test

example 1

[0132]The test piece completed up to the acid cleaning->water rinsing was subjected to draining and drying, Cr3Si particles with a median diameter: 1 μm on a volumetric basis were placed uniformly at a ratio of 5 g / m2 on the test piece, and coated thereon with Ni foil of 8 μm in thickness. Furthermore, a vacuum furnace was used for 2.5 hours under the conditions of 1×10−5 Pa and 900° C., while applying a pressure under the condition of 10 kg / cm2, and furnace cooling was directly carried out.

example 2

[0133]The test piece completed up to the acid cleaning->water rinsing was immersed in the following composite plating solution (1), and with the sheet to be treated as a cathode and a Ni sheet as an anode, a direct-current power-supply unit was used for electrolysis at a current density of 10 A / dm2 for 60 minutes to form a composite plating film on the sheet to be treated. The heat treatment after the composite plate processing was carried out for 3 hours under the conditions of 1×10−3 Pa and 900° C. with the use of a vacuum furnace, and furnace cooling was directly carried out.

Composite Plating Solution (1)Nickel Sulfamate500g / LSodium Chloride10g / LBoric Acid35g / LCrSi2500g / L(Median Diameteron VolumetricBasis: 40 μm)4.560° C.Sediment Co-deposition Method

example 3

[0134]The test piece completed up to the acid cleaning->water rinsing was immersed in the following composite plating solution (2), and with the sheet to be treated as a cathode and a Ni sheet as an anode, a negative-waveform PR pulse method was used for electrolysis for 2 hours to form a composite plating film on the sheet to be treated. The heat treatment after the composite plate processing was carried out for 2 hours under the conditions of an Ar gas atmosphere and 900° C., and furnace cooling was directly carried out.

Composite Plating Solution (2)Nickel Sulfate Hexahydrate200g / LNickel Chloride Hexahydrate50g / LBoric Acid25g / LCrSi220g / L(Median Diameteron VolumetricBasis: 10 μm)CrSi20g / L(Median Diameteron VolumetricBasis: 12.5 μm)4.055° C.Propeller Agitation Method

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Abstract

A method for producing an iron base material having a coating includes forming a Ni—Cr—Si corrosion-resistant alloy coating film by a combination of composite plate processing with a Ni solution containing Cr and Si, and a heat treatment after the composite plate processing, wherein the Ni—Cr—Si corrosion-resistant film contains Ni, Cr, and Si, and wherein a content ratio of Cr is 1 to 50 wt % of the alloy coating film, a content ratio of Si is 0.1 to 30 wt % of the alloy coating film, and the alloy coating film has a thickness of 0.1 to 1000 μm, the composite plate processing forms a composite plating film, in which a chromium silicide particle selected from Cr3Si, Cr5Si3, Cr3Si2, CrSi and CrSi2 is co-deposited in a Ni matrix, and the heat treatment at 600° C. or higher decomposes and solid-solubilizes 50% or more of the chromium silicide particle in the Ni matrix.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This is a divisional application of U.S. application Ser. No. 14 / 112,153, filed on Oct. 16, 2013, which is a national stage application of PCT / JP2012 / 060449, filed on Apr. 18, 2012, which claims the priority of JP 2011-092928, filed on Apr. 19, 2011. This Application claims the benefits and priority of these prior applications and incorporates their disclosures by reference in their entirety.TECHNICAL FIELD[0002]The present invention relates to a highly corrosion-resistant alloy coating film formed on the surface of a metallic material, a method for forming the film, and a component with the film.BACKGROUND ART[0003]Conventionally, ceramics, austenitic stainless steels, and Ni base alloys such as hastelloy (trademark) and inconel have been adopted for structural materials and mechanical components required to have high corrosion resistance. However, these materials are all extremely expensive, and have problems such as difficulty with pro...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): C23C18/48C25D3/56C25D5/50C23C18/16C25D5/18
CPCC23C18/48C23C18/1692C25D3/56C25D5/50C25D5/18B32B15/015C23C18/1662C23C18/34C23C18/36C25D3/12C25D3/18C25D15/00C25D5/619H01M8/0206H01M8/0208H01M8/0228Y02E60/50Y10T428/12778C23C18/52C25D15/02B05D3/0254
InventorNAKADA, KAZUYANAKAJIMA, RYUKONISHI, TOMOYOSHIBEPPU, MASAAKI
OwnerNIHON PARKERIZING