WE CLAIM:
1.A coating pretreatment facility comprising:
a preliminary cleansing section for preliminarily cleansing a coating subject article prior to its coating with preliminary cleansing water;
a degreasing section for effecting a chemical degreasing treatment on the coating subject article preliminarily cleansed by the preliminary cleansing section with degreasing agent solution; and
a flushing section for flushing the coating subject article degreased by the degreasing section with cleansing water;
wherein a preliminary cleansing water supplying passage is provided for supplying the cleansing water used in the flushing of the coating subject article in the flushing section to the preliminary cleansing section as the preliminary cleansing water for use in the preliminary cleansing in this preliminary cleansing section; and
a microbubble generator device is provided for causing the preliminary cleansing water for use in the preliminary cleansing in the preliminary cleansing section to contain microbubbles.
2. The coating pretreatment facility of claim 1, wherein:
the degreasing section includes only a dipping type main
degreasing section for submerging the coating subject article in the degreasing agent solution held in the degreasing tank; and
the degreasing section precludes a preliminary degreasing section for effecting preliminary degreasing treatment on the coating subject article prior to the degreasing treatment at the dipping type main degreasing section.
3. The coating pretreatment facility of claim 1 or 2, wherein:
an iron dust removing device is provided for removing iron dust
contained in the preliminary cleansing water used in the preliminary cleansing of the coating subject article in the preliminary cleansing section by separating the iron dust from the preliminary cleansing water

by a specific weight difference therebetween; and
a degassing means is provided for removing bubbles contained in the preliminary cleansing water to be sent to the iron dust removing device.
4. The coating pretreatment facility of any one of claims 1-3,
wherein:
the flushing section includes a collection tank for collecting the cleansing water used in the cleansing of the coating subject article and a spraying device for cleansing the coating subject article by spraying the cleansing water supplied from the collection tank via a water supplying passage;
the microbubble generator device is arranged to supply the microbubbles to the cleansing water present in either the water supplying passage or the collection tank;
the preliminary cleansing water supplying passage is arranged to supply the cleansing water in the collection tank to the preliminary cleansing section as the preliminary cleansing water; and
a cleansing water supplying passage is provided for supplementing new cleansing water to the collection tank.