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Powder Coated Sheet Metal

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What`s Powder Coating

Powder coating is a dry finishing process that has become extremely popular. Powder coating is used on a wide array of products.  More and more companies specify powder coatings for a high-quality, durable finish, allowing for maximized production, improved efficiencies, and simplified environmental compliance. Used as functional (protective) and decorative finishes, powder coatings are available in an almost limitless range of colors and textures, and technological advancements have resulted in excellent performance properties.

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Advantages over other coating processes

1. Environment friendly. Powder coatings contain no solvents and release little or no amount of volatile organic compounds (VOC) into the atmosphere.

2. More thicker coatings without running or sagging than conventional liquid coatings.

3. Perfect color consistency. Powder coated items generally have fewer appearance differences than liquid coated items between horizontally coated surfaces and vertically coated surfaces.

4. A wide range of speciality effects are easily accomplished using powder coatings that would be impossible to achieve with other coating processes.

5. Curing time is significantly faster with powder coatings compared to liquid coatings especially when using ultraviolet cured powder coatings or advanced low bake thermosetting powders.

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Powder Coating Process

The Powder coating process involves three basic steps: raw material preparation or the pre-treatment, the powder coating application and curing.

Powder Coating Substrate Considerations

Before applying the powder coating material, you must first consider the substrate material that you will be coating. It is very important to have a clear understanding of the true composition of the surface of the part.

ALUMINUM:

ALUMINUM CASTING

COLD/HOT ROLLED STEEL

CAST IRON

BRASS

COPPER

ZINC

STAINLESS STEEL

 

Powder Coating Properties:

Coating Properties

 Mechanical Properties

 Pencil hardness                          GB/T 6739-1996 H-2H

 Adhesion (cross-cut method)     GB/T 9286-1998  Grade 0

 Bending test                               GB/T 6742-1986 ≤ 2mm

 Impact test                                GB/T 1732-1993 ≥50kg.cm

 Cupping test                              GB/T 9753-1988 ≥7mm

 Corrosion Resistance

 Salt spray test                           GB/T 1771-1991 >500 hours, 

 no change, crossion width at crossing ≤ 2mm

 Damp heat test                          GB/T 1740-1979 >1000 hours, 

 mild loss of gloss

 Temperature resistance 100°C/48 hours, excellent gloss retention

 

 

Powder Coating Colours

RALAL Range, Pantone Range, and other Natural Colour Systems (NCS)

If you have a Powder Coating Colour requirement that we do not stock we are usually able to source powders from the above ranges within 48 hours.

 

Powder Coating Gloss Level

Gloss is measured as a percentage.

1. Matt Powders are between 20% and 30% gloss.

2. Semi-gloss Powders are usually around 60-65% gloss.

3. Gloss Powders at least 80% and can be 85%.

 

Powder Coating finishes

1. Textured Powder Coating:

2. Ripple/Leatherette Powder Coating.

3. Hammerite Finish Powder Coating.

4. High Temperature Powder Coating.

5. Anti-Bacterial Powder Coating.

6. Clear or Tinted Powder Coatings.

 

Application Field

1. In automotive applications:

a) some primers used on bodywork have converted to powder. This has given improved coating quality and provided ecological advantages.

b) where a functional as well as a decorative finish is desirable powder coatings are being used increasingly eg.

i. - wheels,

ii. - bumper bars,

iii. - mirror frames,

iv. - oil filters,

v. - battery trays,

vi. - coil springs and

vii. - heads.

 

2. Appliances

a) Specially formulated, hard and scratch resistant powder coatings are replacing the energy-intensive porcelain finishes on washer tops and lids.

b) Powder coatings are being used on range housings, freezer cabinets, drier drums, and microwave oven cavities.

c) Outdoor furniture, farm and garden implements and garden tractors also are being finished with powder coating materials. - Interior fluorescent light reflectors are coated using a highly reflective, very thin powder coating.

d) Exterior lamp housings on highway and parking deck fixtures are coated with specially formulated powder which give ultra violet light protection and added corrosion protection




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