Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Conversion coating for magnesium, beryllium and their alloys and articles thereof

a technology of conversion coating and beryllium, which is applied in the direction of electrolytic organic material coating, liquid/solution decomposition chemical coating, protein coating, etc., can solve the problems of chromates and related toxic materials being displaced by less toxic alternatives, oxidized or phosphate generated conversion coatings tending to be brittle, and provide no secondary corrosion resistance. , to achieve the effect of easy acceptance of applied coatings and more corrosion resistance surfaces

Inactive Publication Date: 2009-07-16
SAN FU CHEM CO LTD
View PDF4 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]This invention provides an aqueous conversion coating composition for the magnesium and beryllium metals, to generate an outer protective coating on the magnesium and beryllium metals. The protective conversion coating composition has as its essential ingredients thereof protein compounds or proteins that will react with the magnesium and beryllium metals to generate in-situ a coating that will more easily accept applied coatings and provide for a more corrosion resistant surface.

Problems solved by technology

As a result, chromates and related toxic materials are being displaced by less toxic alternatives.
Oxidized or phosphate generated conversion coatings tend to be brittle.
Such a surface needs to be painted immediately after being produced as it will quickly oxidize and it provides no secondary corrosion resistance.
These processes are rather difficult to properly apply and even with the use of the above processing steps, the plating of magnesium and / or Beryllium is a very difficult process and needs to be sealed to prevent secondary corrosion problems or disbondment of the plating (see: Sakata, “Electroless Nickel Plating Directly on Magnesium Alloy Die Castings”, 74th AESF Technical Conference (1987) 15).

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0020]A flat six inch by four inch panel of “AZ91D” magnesium alloy was soaked in a PH 13.0 alkaline cleaner at 180° F. for five minutes to remove all mold release compounds and / or oils, rinsed in D.I. water, made the cathode of an electrolytic cell containing 0.5% potassium hydroxide. This is electrolytically cleaned at 20 amps per square foot for five minutes at 120° F., rinsed in D.I., dipped in a PH 2.0 nitric acid solution for about 15 seconds to remove magnesium oxides, rinsed in D.I. water and made the cathode in a casein solution at a PH of 7.5. The casein solution consists of:

4.0% Casein0.15% potassium hydroxide1.2% potassium salt of Glycolic acidPhosphoric acid used to adjust PH to 7.5

[0021]The casein was plated out on the surface of the metal with a current density of 14 amps per square foot for two seconds. The casein conversion coated magnesium alloy was then rinsed, dried and allowed to sit in the open for one week before being painted with a water based Epoxy Polyamid...

example 2

[0022]A flat six inch by four inch panel of “AZ312B” magnesium alloy was soaked in a PH 13.0 alkaline cleaner at 180° F. for five minutes to remove all mold release compounds and / or oils, rinsed in D.I. water, made the cathode of an electrolytic cell containing 0.5% potassium hydroxide and electrolytically cleaned at 20 amps per square foot for five minutes at 120° F., rinsed in D.I., dipped in a PH 2.0 nitric acid solution for about 15 seconds to remove magnesium oxides, rinsed in D.I. water and made the cathode in a casein solution at a PH of 4.0. The casein solution consists of:

1.0% CaseinPhosphoric acid used to adjust PH to 4.0Balance water

[0023]The casein was plated out on the surface of the metal with a current density of 14 amps per square foot for four seconds. The casein conversion coated magnesium alloy was then rinsed, dried and allowed to sit in the open for one week before being painted with a water based Epoxy Polyamide resin meeting the requirements of “Boeing” materi...

example 3

[0024]A flat six inch by four inch panel of “AZ91D” magnesium alloy was soaked in a PH 13.0 alkaline cleaner at 180° F. for five minutes to remove all mold release compounds and / or oils, rinsed in D.I. water, made the cathode of an electrolytic cell containing 0.5% potassium hydroxide and electrolytically cleaned at 20 amps per square foot for five minutes at 120° F., rinsed in D.I., dipped in a PH 2.0 nitric acid solution for about 15 seconds to remove magnesium oxides, rinsed in D.I. water and made the cathode in a casein solution at a PH of 3.0. The casein solution consists of:

4.0% CaseinGlycolic acid used to adjust PH to 3.0Balance water

[0025]The casein was plated out on the surface of the metal with a current density of 14 amps per square foot for two seconds. The casein conversion coated magnesium alloy was then rinsed, dried and allowed to sit in the open for one week before being painted with a water based Epoxy Polyamide resin meeting the requirements of “Boeing” materials ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Temperatureaaaaaaaaaa
Temperatureaaaaaaaaaa
Fractionaaaaaaaaaa
Login to View More

Abstract

I provide a non-toxic protein and protein compound conversion coated metal article, a painted or plated non-toxic protein and protein compound conversion coated metal article, the aqueous coating solution to provide the in-situ conversion protective coating, and a process of preparing the article. The article is a metal selected from the group consisting of magnesium, magnesium alloy, beryllium and beryllium alloy. The solution has a pH of 3.0 to 12.0 and preferably 4.0 to 10.0 and a protein and protein compound concentration of 0.1 to 10% by weight and the protein and protein compound have a molecular mass of 16,700 to 1,000,000.

Description

FIELD OF INVENTION[0001]The present invention relates to the application and generation of a non-toxic and environmentally safe protein or protein compounds based conversion coating for magnesium, its alloys and Beryllium and its alloys. More particularly the invention relates to a composition and a method of conversion coating magnesium, its alloys, and Beryllium and its alloys with a non-toxic and environmentally friendly protein composition that reacts in-situ with the surface of the metal to generate a conversion coating that incorporates the metal in question.BACKGROUND OF THE INVENTION[0002]The chemical conversion coating of magnesium, its alloys and beryllium and its alloys is known in the art as a process whereby the surface of the metal is chemically converted to a surface that more easily accepts applied coatings, i.e. paint, and / or increases the corrosion resistance of the metal. An industry accepted process for the conversion coating of magnesium, its alloys and berylli...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C09D189/00B05D5/12
CPCC09D189/00C09D189/005C23C18/1692C23C18/1844C23C18/1848C25D11/34C25D9/02C25D11/06C25D11/246C25D11/30C23C18/31
Inventor BIBBER, JOHN W.
Owner SAN FU CHEM CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com