After assembling and welding spare parts of transformer tank, we will do surface treatment for it. The surface treatment normally is Painting and Powder coating.
There are 15 problems always happen and affect the quality of transformer tank in the painting processes:
1.Transformer Tank Painting has Pinholes.
It is caused by the air bubbles mixed in the paint film and the bursting of other bubbles, which can not be leveled before the film is dried (cured), and also by the improper treatment of the transformer tank steel sheet or coating (too thick paint film, etc.).
2.Transformer Tank Painting with Bubbling.
Gases such as air or solvent vapor formed during the coating process. This kind of foam can disappear or exist permanently during the drying process of the paint film.
3.Transformer Tank Painting with Blushing.
In the drying process of glossy coatings, the film sometimes appears milky white. This is due to the condensation of water in the air on the surface of wet paint film and the precipitation of one or more exogenous components in the paint.
4.Lifting occurs on Transformer Tank Painted surface.
When the same or different coatings are sprayed on the paint film, the dry paint film underneath the coatings will soften, bulge or detach from the substrate during spraying or drying (usually appearance like wrinkling).
5.Transformer Tank Painting has Seedy.
Coarse Particles in Spraying Process on Oil tank surface. (a few crusts, gelatin, agglomerates or foreign coarse grains)
6.Oil Tank Surface Cissing.
The varnish film exhibits an uneven appearance in varying degrees and distributions. This is because the inter-facial tension between wet paint film and base material (or dry paint film) is too large, wettability is small, the surface of steel plate is not well treated, contains oil pollution and moisture, and pipelines are mixed with oil and water during spraying.
7.Painting not dry or dry slowly.
After painting for a period time, the painted film is still not dry and does not harden.
8.Loss of Gloss on Painted surface.
The phenomenon that the gloss of paint film decreases due to the influence of climate and environment.
9.Runs on Transformer tank painted surface.
When the paint is applied on the vertical surface, the wet film moves downward due to poor sagging resistance, improper spraying and excessive thickness of the paint film, resulting in uneven thickness of the lower edge of various shapes.
10. Ropiness on Transformer tank painted surface.
Nearly parallel linear stripes appear on the surface of wet paint film and still exist after the film is dried. For example, in dipping or flow painting, the filament appears along the direction of flow; in brushing, the filament appears along the direction of the last brushing film.
11.Orange Skin on Distribution Power Transformer Oil Tank Coated surface.
The paint film has a poor orange peel appearance. This morbidity is easy to occur in spraying construction, especially when the base material is flat.
12.Cracking on painted surface.
Discontinuous changes in the appearance of the paint film occurred. Usually due to the aging of paint film.
13.Peeling, Blistering of Oil tank Paint.
The phenomenon that the coating is detached from the underlying coating or that the coating is completely detached from the substrate.
14.Transformer Tank Paint Film Rough.
Coatings are painted on the surface of transformer tank. There are many particles in the coating film. The particles are like prickly protrusions. They feel rough and not smooth.
15.Transformer Tank Paint sticky.
After drying, some or all of the adhesive marks occur on the coated transformer tank surface.
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