According to different metals, the surface coating cleaning method is also different, mainly based on the hardness of different metals. The following four common metals are listed on the China Standard Parts Network: steel, galvanized steel, aluminum and other soft materials. Metal and alloy steel, detailed introduction to surface coating and cleaning methods.
1. Steel
The most effective way to clean uncoated steel is to use solvent cleaning or steam cleaning after sandblasting. In fact, SSPC standards require solvent cleaning before hand and power tool cleaning and sandblasting. Sandblasting is recommended for cleaning damaged areas. Water blasting and water blasting are also good options, especially in areas where dry blasting is unacceptable. Other methods, such as hand or power tool cleaning, are better suited for smaller repairs.
2. Galvanized steel
Recommended cleaning methods for uncoated galvanized steel vary depending on the surface conditions. A simple solvent cleaning of 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 methods. Epoxy and latex coatings have no roughness requirements and can bond tightly to smooth, clean galvanized sheet surfaces, but some applicators find it necessary to use phosphoric acid or other chemical treatments.
3. Aluminum and other soft metals
New, clean aluminum and other soft metals can be adequately cleaned with solvent cleaning. Dust and loose corrosion can be removed with detergent; old paint can be removed with plastic particles or other light sandblasting methods. Sandblasting with coarse particles (steel beads or steel pellets) will 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 relies on the natural oxide film formed. If you need to remove inconspicuous rust spots for painting, you need high-pressure or ultra-high-pressure water jetting. In order to achieve surface roughness, it is also required to increase sandblasting particles. Generally, the coating system commonly used for steel structures is used.
The purpose of surface coating of metal materials is to achieve a satisfactory appearance. In order to make the primer adhere closely to stainless steel or other hard metals, sufficient roughness is required, usually using hard non-ferrous sandblasting particles, such as alumina, garnet, and emery.
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