Engine part
First Claim
Patent Images
1. An engine part comprising:
- a metal substrate;
a chromium plating layer covering at least a region of a surface of the metal substrate, the region being heated to a temperature of about 350°
C. or more; and
an intermediate plating layer provided between the metal substrate and the chromium plating layer;
whereinthe chromium plating layer has a thickness in a range from about 0.2 μ
m to about 0.9 μ
m in the region;
the chromium plating layer includes decorative chromium plating; and
the intermediate plating player includes at least one of C and S.
1 Assignment
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Accused Products
Abstract
An engine part has a construction which prevents the surface discoloration/deterioration associated with a high-temperature exhaust gas, irrespective of the type of Cr used in the formation of a chromium plating layer (hexavalent chromium or trivalent chromium). The engine part includes a metal substrate, a chromium plating layer covering at least a region of a surface of the metal substrate, the region being heated to a temperature of about 350° C. or more, and an intermediate plating layer provided between the metal substrate and the chromium plating layer. The chromium plating layer has a thickness of about 0.2 μm or more in the region.
13 Citations
30 Claims
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1. An engine part comprising:
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a metal substrate; a chromium plating layer covering at least a region of a surface of the metal substrate, the region being heated to a temperature of about 350°
C. or more; andan intermediate plating layer provided between the metal substrate and the chromium plating layer;
whereinthe chromium plating layer has a thickness in a range from about 0.2 μ
m to about 0.9 μ
m in the region;the chromium plating layer includes decorative chromium plating; and the intermediate plating player includes at least one of C and S. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 28)
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14. An engine part comprising:
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a metal substrate; a chromium plating layer covering at least a portion of a surface of the metal substrate; and an intermediate plating layer provided between the metal substrate and the chromium plating layer;
whereina type of Cr composing the chromium plating layer substantially has an amorphous structure, and an Fe content in the chromium plating layer is about 2 mass % or less; the chromium plating layer covers a region of the surface of the metal substrate, the region being heated to a temperature of about 350°
C. or more, and the chromium plating layer has a thickness in a range from about 0.2 μ
m to about 0.6 μ
m in the region;the chromium plating layer includes decorative chromium plating; and the intermediate plating layer includes at least one of C and S. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 29)
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25. An exhaust pipe comprising:
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a metal tube having a bent portion; a decorative chromium plating layer arranged so as to cover at least an outer convex surface being defined by a portion of the bent portion, the decorative chromium plating layer having a thickness in a range from about 0.2 μ
m to about 0.5 μ
m; andan intermediate plating layer provided between the bent portion and the decorative chromium plating layer;
whereinthe intermediate plating layer includes at least one of C and S. - View Dependent Claims (26, 27, 30)
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Specification