Well covers are exposed to wind and sunshine outdoors, which can easily become dirty and old, affecting the city's appearance! Today, Shandong Ductile Iron Well Cover Factory will summarize the common maintenance and cleaning methods for the surface of Ductile Iron Well Cover, hoping to help you!
1. Rust spots of nodular graphite castings
Rust on stainless steel products or equipment is sometimes seen before or during manufacture, which indicates that the surface is seriously polluted. The rust must be removed before the equipment is put into use. The thoroughly cleaned surface should be inspected by iron test and/or water test.
2。 Dust on the Surface of Nodular Graphite Castings
The production of steel castings is often carried out in dusty sites. There are many dusts in the air, which constantly fall on the surface of equipment. They can be removed by water or alkaline solution. However, adherent dust requires high-pressure water or steam to clean up.
3。 Floating iron powder or embedded iron on the surface of ductile iron castings
On any surface, free iron rusts and corrodes stainless steel。 Therefore, it must be cleared。 Floating powder can generally be removed with dust。 Some have strong adhesion and must be treated with embedded iron。 In addition to dust, there are many sources of surface iron, including cleaning with ordinary carbon steel wire brushes and peening with sand, glass beads or other abrasives previously used in plain carbon steel, low alloy steel or cast iron castings, or grinding of previously mentioned non-stainless steel products near stainless steel parts and equipment。 If the stainless steel is not protected during the lifting process, the steel wire rope, hanger and iron on the working table surface can easily be embedded or stained。
4。 Scratch of Ductile Iron Castings
In order to prevent the accumulation of process lubricants or products or dirt, scratches and other rough surfaces must be mechanically cleaned.
5。 Rough Grinding and Machining
Grinding and machining can cause surface roughness, grooves, overlaps and burrs。 Each defect may also cause metal surface damage to a certain depth, so that the damaged metal surface can not be cleaned up by pickling, electropolishing or shot peening。 Rough surface can be the source of corrosion and deposition products。 No rough grinding can be used to clean weld defects or remove excess weld reinforcement height before re-welding。 In the latter case, fine abrasives should be used again。
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