Patent ID: 8449753

Claim:
An apparatus for plating pretreatment of a cylinder block, comprising: a seal jig sealing one end of a cylinder inner wall surface of a cylinder in the cylinder block; and an electrode performing a plating pretreatment of the cylinder inner wall surface, wherein the seal jig is disposed to one end of the electrode through a female thread part, a seal jig attachment plate and bolts for fastening, wherein the seal jig is disposed at an upper end portion of the electrode, the electrode disposed to face the cylinder inner wall surface, the electrode forming a gap flow channel between the cylinder inner wall surface and the outer surface of the electrode, the electrode having an in-electrode flow channel formed therein, wherein the gap flow channel communicates with the in-electrode flow channel via a communicating hole formed in the gap flow channel and by a lower surface of the seal jig and the upper end portion of the electrode at a position closest to the seal jig and an upper end portion of the gap flow channel, the gap flow channel being adapted to introduce a treatment liquid to the cylinder inner wall surface and flow the treatment liquid therethrough toward the seal jig, and the in-electrode flow channel is adapted to receive and flow therethrough the treatment liquid having passed through the communicating hole, and wherein the flow channel cross-sectional area of the communicating hole is smaller than the flow channel cross-sectional area of the gap flow channel.