company news about Metal and non-metal surface coating cleaning methods

Different metals have their own surface treatment methods, mainly depending on the hardness of the metal.

1. Steel

The method of cleaning uncoated steel is to use solvent cleaning or steam cleaning after sandblasting. In fact, the SSPC standard requires solvent cleaning before hand and power tool cleaning and sandblasting. Sand blasting is recommended for cleaning damaged areas. Water injection and water sandblasting are also good options, especially in areas that cannot accept dry sandblasting. Other methods, such as manual or power tool cleaning, are more suitable for a small range of repairs.

2, galvanized steel

Due to different surface conditions, the recommended cleaning methods for uncoated galvanized steel vary. A simple solvent cleaning of a new, clean galvanized sheet is sufficient to remove any protective oil used for outdoor storage of the galvanized sheet. Other temporary protective measures such as chromate treatment must be removed using the manufacturer's recommended method. Epoxy and latex coatings have no roughness requirements and can be tightly bonded to smooth, clean galvanized sheet surfaces, but some builders find it necessary to use phosphoric acid or other chemical treatments.

3. Aluminum and other soft metals

New and clean aluminum and other soft metals can be cleaned adequately with solvent cleaning. Dust and loose corrosion can be removed by cleaning agents; Old paint can be removed with plastic particles or other light sandblasting methods whereas sandblasting with coarse particles (steel balls or pellets) can damage soft metal surfaces. These metal surfaces can be cleaned first to increase adhesion to oil-based or latex paints.

4. Alloy steel

Low alloy steel generally does not need to be protected by coating, but depends on the natural oxide film formed. If it is necessary to remove the insignificant rust spots for painting, high pressure or ultra-high pressure water injection method is required. In order to achieve surface roughness, it is also required to increase the sand blasting particles. Generally, the coating system usually used in steel structures is used.

Stainless steel coating is designed for satisfactory appearance. In order for the primer to adhere closely to stainless steel or other hard metals, sufficient roughness is required, usually with hard non-iron sandblasting particles, such as alumina, garnet, emery.