US4853295A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface treated steel material particularly electroplated steel sheet
Assignee: Nippon Steel Corp
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Filing: 1987-05-13
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Granted: 1989-08-01
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Expires: 2007-05-13
Abstract
Abstract In the electroplated steel sheets for automobile use, the chipping resistance, water-resistant adhesion, unpainted corrosion resistance, post-painted corrosion resistance, and resistance to secular exposure are improved by superimposing a chemical conversion layer between electroplated layers of zinc and iron, nickel, cobalt, or alloys thereof.
Inventors
- 👤 Yoshio Shindo
- 👤 Koichi Wada
- 👤 Fumio Yamazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:19
CPC Classifications
C; C23; C23C; C23C28/00; C23C22/00; C23C22/05; C23C22/06; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12611; Y10T428/12771; Y10T428/12785; Y10T428/12792; Y10T428/12799; Y10T428/12861; Y10T428/12951; Y10T428/12972
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
64 words
A steel material having at least one lower plated layer of material plated directly on the steel selected from the group consisting of Zn, a Zn series alloy, and a Zn composite material, an upper plated layer of material selected from the group consisting of Fe, Ni, Co and Fe-series alloy, and a chemical conversion layer interposed between the upper and lower plated layers.
Claim 2
Dependent Claim
64 words
A steel material having at least one lower plated layer of material plated directly on the steel selected from the group consisting of Zn, a Zn series alloy, and a Zn composite material, an upper plated layer of material selected from the group consisting of Fe, Ni, Co and Fe-series alloy, and a chemical conversion layer interposed between the upper and lower plated layers.
Claim 3
Dependent Claim
26 words
A steel material according to claim 1, in the form of a sheet and having said plated layers on at least one surface of said sheet.
Claim 4
Dependent Claim
19 words
A steel material according to claim 1, wherein said chemical conversion layer is a phosphate layer formed by phosphatizing.
Claim 5
Dependent Claim
29 words
A steel material according to claim 3, wherein said chemical conversion phosphate layer is in an amount of approximately 100 mg/m 2 or less in terms of P (phosphorous).
Claim 6
Dependent Claim
19 words
A steel material according to claim 3, wherein said chemical conversion layer is a chromate layer formed by chromating.
Claim 7
Dependent Claim
29 words
A steel material according to claim 3, wherein said chemical conversion chromate layer is in an amount of approximately 100 mg/m 2 or less in terms of Cr (chromium).
Claim 8
Dependent Claim
44 words
A steel material according to claim 2, 3, 4, 5 or 6, wherein at least one of said lower plated layers comprises a Zn series-alloy or Zn-composite material and said upper plated layer comprises an Fe-series alloy containing at least 70% by weight Fe.
Claim 9
Dependent Claim
73 words
A steel material comprising a lower plated layer of a metal plated directly on the steel selected from the group consisting of Fe, Ni and Co, an upper plated layer comprising an Fe-series alloy containing at least 70% by weight Fe, a middle plated layer comprising a Zn series alloy or Zn-composite material between said lower and upper plated layers and a chemical conversion layer interposed between said middle and upper plated layers.
Claim 10
Dependent Claim
73 words
A steel material comprising a lower plated layer of a metal plated directly on the steel selected from the group consisting of Fe, Ni and Co, an upper plated layer comprising an Fe-series alloy containing at least 70% by weight Fe, a middle plated layer comprising a Zn series alloy or Zn-composite material between said lower and upper plated layers and a chemical conversion layer interposed between said middle and upper plated layers.
Claim 11
Dependent Claim
19 words
A steel material according to claim 8, wherein said chemical conversion layer is a phosphate layer formed by phosphatizing.
Claim 12
Dependent Claim
29 words
A steel material according to claim 9, wherein said chemical conversion phosphate layer is in an amount of approximately 100 mg/m 2 or less in terms of P (phosphorous).
Claim 13
Dependent Claim
19 words
A steel material according to claim 9, wherein said chemical conversion layer is a chromate layer formed by chromating.
Claim 14
Dependent Claim
29 words
A steel material according to claim 9, wherein said chemical conversion chromate layer is in an amount of approximately 100 mg/m 2 or less in terms of Cr (chromium).
References Cited (Backward Citations)
JPS52645A
Cited
JPS52646A
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JPS5858294A
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JPS5989785A
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JPS59200789A
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JPS60131991A
Cited
JPS60141898A
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JPH0696786A
Cited
JPH0638480A
Cited
JPH06164899A
Cited
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1992-07-31 | 1993-01-30 | 1993-08-01 | $2000.00 | Window Closed / Lapsed |
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