Patent ID: 11965252
Assignee: NISSAN MOTOR CO., LTD.
Field: Surface technology, coating (Chemistry)
Classification: CPC C  F | IPC C  F

Claim 3:
4. A method for forming a thermally sprayed iron-based coating on an inner circumferential surface of an aluminum or aluminum alloy cylinder block, the method comprising:
a thermal spraying step comprising forming the thermally sprayed iron-based coating on the inner circumferential surface of the aluminum or aluminum alloy cylinder block;
a mirror polishing step comprising mirror polishing a surface of the thermally sprayed iron-based coating; and
a finishing step comprising causing plastic flow on the surface of the thermally sprayed iron-based coating to form a plastic deformation part,
wherein the finishing step is performed such that an area ratio of an area of a surface of the plastic deformation part to an area of the surface of the thermally sprayed iron-based coating is 4.6% or greater, and a surface roughness (Ra) of the thermally sprayed iron-based coating is caused to be 0.1 μm or less by using a whetstone that is a honing stone on which diamond abrasive grains are bonded with Cu—Sn alloy having a hardness of 380 to 480 HV.