Patent · US6740424B2 · B2 · US

Surface coated aluminum fine powder and aqueous chromium-free corrosion inhibiting coating composition including the same

(11) Publication number

US6740424B2

(21) Application number

US-92007801-A

(22) Filing date

2001-08-01

(30) Priority date

2000-08-02

(43) Publication date

2004-05-25

(45) Date of grant

2004-05-25

(52) CPC

C09C Treatment of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties; preparation of carbon black {; preparation of inorganic materials which are no single chemical compounds and which are mainly used as pigments or fillers}: 1/642, 1/64
B22F Working metallic powder; manufacture of articles from metallic powder; making metallic powder; apparatus or devices specially adapted for metallic powder: 1/145
C01P Indexing scheme relating to structural and physical aspects of solid inorganic compounds: 2004/32, 2004/51, 2004/61, 2004/62, 2004/86, 2006/22, 2006/40, 2006/80, 2006/90
C09D Coating compositions, e.g. paints, varnishes or lacquers; filling pastes; chemical paint or ink removers; inks; correcting fluids; woodstains; pastes or solids for colouring or printing; use of materials therefor: 5/103
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: 22/74
Y10T Technical subjects covered by former us classification: 428/12097, 428/12181

(54) Title

Surface coated aluminum fine powder and aqueous chromium-free corrosion inhibiting coating composition including the same

(57) Abstract

A chromium-free corrosion inhibiting coating composition, which does not utilize harmful chromium compounds and can be used for corrosion inhibition of a metal surface, comprising a slurry mixture in which coated aluminum fine powder treated with a hydrophilic coupling agent is suspended in an acidic phosphate bonding solution and which can be stored in a refrigerator, is disclosed. A titanium-coupling agent is preferable to use as the coupling agent, which treats a surface of the aluminum fine powder. In this aqueous chromium-free corrosion inhibiting coating composition, 25 to 40% by weight of the aluminum fine powder a surface of which is treated with the coupling agent is suspended in the acidic phosphate bonding solution.

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Claims (7)

An aluminum fine powder with overcoat for sacrifice corrosion inhibiting coating, the aluminum fine powder with overcoat comprising: aluminum fine powder having a surface; and a hydrophilic coupling agent overcoat directly on said surface of said aluminum fine powder.
The aluminum fine powder according to claim 1 wherein the overcoat is a titanium-coupling agent overcoat.
An aqueous chromium-free coating composition, comprising a slurry mixture in which 25 to 40% by weight of aluminum fine powder is suspended in an acidic phosphate-based aqueous bonding solution, the aluminum fine powder having a hydrophilic coupling agent overcoat directly on a surface of the aluminum fine powder.
The aqueous chromium-free coating composition according to claim 3, wherein said is a titanium-coupling agent.
The corrosion inhibiting coating composition according to claim 4, wherein said phosphate-based aqueous bonding solution contains phosphate ions, aluminum ions, zinc ions, and two or more kinds of alkaline earth metal ions.
An aqueous chromium-free corrosion inhibiting coating composition, comprising a slurry mixture in which 25 to 40% by weight of aluminum fine powder a surface of which is directly treated with a hydrophilic coupling agent is suspended in an acidic phosphate-based aqueous bonding solution, the bonding solution containing phosphate ions, aluminum ions, zinc ions, two or more kinds of alkaline earth metal ions and 0.2 to 1% by weight of polyphosphate ions.
The corrosion inhibiting coating composition according to claim 6, wherein the hydrophilic coupling agent is a titanium-coupling agent.

Citations (5)

US3248251A
US5242488A
US5272223A
US5478413A
US5803990A

Record as JSON

{
  "publication_number": "US6740424B2",
  "country": "US",
  "kind": "B2",
  "title": "Surface coated aluminum fine powder and aqueous chromium-free corrosion inhibiting coating composition including the same",
  "abstract": "A chromium-free corrosion inhibiting coating composition, which does not utilize harmful chromium compounds and can be used for corrosion inhibition of a metal surface, comprising a slurry mixture in which coated aluminum fine powder treated with a hydrophilic coupling agent is suspended in an acidic phosphate bonding solution and which can be stored in a refrigerator, is disclosed. A titanium-coupling agent is preferable to use as the coupling agent, which treats a surface of the aluminum fine powder. In this aqueous chromium-free corrosion inhibiting coating composition, 25 to 40% by weight of the aluminum fine powder a surface of which is treated with the coupling agent is suspended in the acidic phosphate bonding solution.",
  "claims": [
    "1. An aluminum fine powder with overcoat for sacrifice corrosion inhibiting coating, the aluminum fine powder with overcoat comprising: aluminum fine powder having a surface; and a hydrophilic coupling agent overcoat directly on said surface of said aluminum fine powder.",
    "2. The aluminum fine powder according to claim 1 wherein the overcoat is a titanium-coupling agent overcoat.",
    "3. An aqueous chromium-free coating composition, comprising a slurry mixture in which 25 to 40% by weight of aluminum fine powder is suspended in an acidic phosphate-based aqueous bonding solution, the aluminum fine powder having a hydrophilic coupling agent overcoat directly on a surface of the aluminum fine powder.",
    "4. The aqueous chromium-free coating composition according to claim 3, wherein said is a titanium-coupling agent.",
    "5. The corrosion inhibiting coating composition according to claim 4, wherein said phosphate-based aqueous bonding solution contains phosphate ions, aluminum ions, zinc ions, and two or more kinds of alkaline earth metal ions.",
    "6. An aqueous chromium-free corrosion inhibiting coating composition, comprising a slurry mixture in which 25 to 40% by weight of aluminum fine powder a surface of which is directly treated with a hydrophilic coupling agent is suspended in an acidic phosphate-based aqueous bonding solution, the bonding solution containing phosphate ions, aluminum ions, zinc ions, two or more kinds of alkaline earth metal ions and 0.2 to 1% by weight of polyphosphate ions.",
    "7. The corrosion inhibiting coating composition according to claim 6, wherein the hydrophilic coupling agent is a titanium-coupling agent."
  ],
  "cpc": [
    "C09C 1/642",
    "B22F 1/145",
    "C01P 2004/32",
    "C01P 2004/51",
    "C01P 2004/61",
    "C01P 2004/62",
    "C01P 2004/86",
    "C01P 2006/22",
    "C01P 2006/40",
    "C01P 2006/80",
    "C01P 2006/90",
    "C09C 1/64",
    "C09D 5/103",
    "C23C 22/74",
    "Y10T 428/12097",
    "Y10T 428/12181"
  ],
  "filing_date": "2001-08-01",
  "publication_date": "2004-05-25",
  "grant_date": "2004-05-25",
  "priority_date": "2000-08-02",
  "application_number": "US-92007801-A",
  "family_id": "18726337",
  "citations": [
    "US3248251A",
    "US5242488A",
    "US5272223A",
    "US5478413A",
    "US5803990A"
  ]
}

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