Engine part
First Claim
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;
wherein the chromium plating layer has a thickness of about 0.2 μ
m or more in the region.
1 Assignment
0 Petitions
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.
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Citations
41 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; and
an intermediate plating layer provided between the metal substrate and the chromium plating layer;
whereinthe chromium plating layer has a thickness of about 0.2 μ
m or more in the region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 35)
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17. 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. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 36)
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31. An exhaust pipe comprising:
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a metal tube having a bent portion; and
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 of about 0.2 μ
m or more. - View Dependent Claims (32, 33, 34, 37)
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38. A method of producing an engine part, comprising the steps of:
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placing a metal substrate in a plating apparatus;
forming an intermediate plating layer on the metal substrate; and
using a chromium plating bath, performing plating while placing the metal substrate with the intermediate plating layer formed thereon in such a manner that a chromium plating layer having a thickness of about 0.2 μ
m or more is formed in a region of a surface of the metal substrate, the region being heated to a temperature of about 350°
C. or more. - View Dependent Claims (39, 40, 41)
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Specification