ENGINE RING MADE OF ALUMINUM AND ITS PRODUCTION

Title:

ENGINE RING MADE OF ALUMINUM AND ITS PRODUCTION

Document Type and Number:

Japanese Patent JPH0820889

Kind Code:

A

Abstract:

PURPOSE: To produce an engine ring made of aluminum having a film of a thin layer capable of horning and not deteriorating the capacity of an engine by providing the sliding face of the inside diameter with a chromium plated layer having specified hardness.

CONSTITUTION: The sliding face of the inside diameter of an engine cylinder made of aluminum is provided with a chromium plated layer having hardness of 700 to 800Hv. This chromium plated layer can be formed by executing plating at 61 to 65°C plating soln. temp. and 20 to 60A/dm2 current density using a plating soln. having a compsn. of 250g/L chromic acid and 2.5g/L sulfuric acid. After that, this chromium plated layer is subjected to horning, by which the cylinder having prescribed inside diameter can efficiently be produced.

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Inventors:

INOGUCHI KAZUHIKO
SUGITA HIROSHI
KOBAYASHI YOSHIO
MURASE SHIRO

Application Number:

JP18056794A

Publication Date:

January 23, 1996

Filing Date:

July 08, 1994

Export Citation:

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Assignee:

MITSUBISHI HEAVY IND LTD

International Classes:

F02F1/00; C25D3/06; C25D5/48; C25D7/00; (IPC1-7): C25D7/00; C25D3/06; C25D5/48; F02F1/00

Attorney, Agent or Firm:

Jiro Nagaya (2 outside)

Next Patent: 電子制御装置