Alloy aluminum sheet - selection guide
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發布日期:2014-11-20
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作者:佚名
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Alloy aluminum plate material selection guideFirst, product selection guideProducts can be divided into:1) Aluminum alloy sheets can be divided into two categories: non-painted products and ..........
Alloy aluminum plate material selection guide

First, product selection guide

Products can be divided into:

1) Aluminum alloy sheets can be divided into two categories: non-painted products and painted products according to the surface treatment.

2) According to the painting process, it can be divided into: spray plate product and pre-roll coated plate;

3) According to the type of paint can be divided into: polyester, polyurethane, polyamide, modified silicon, fluorocarbon and so on.

Specification

The single-layer aluminum plate may be a pure aluminum plate, a manganese alloy aluminum plate or a magnesium alloy aluminum plate.

The fluorocarbon aluminum plate has two kinds of fluorocarbon sprayed plates and fluorocarbon pre-rolled coated aluminum plates.

Sheet thickness ≥2.0mm

Product Standards

GB / T 3880 "Aluminum and aluminum alloy rail plate"

GB/T5237 "Aluminum Alloy Building Profiles"

1.5 Main technical requirements of the product

parameter name(*)

 

Indicator requirements (*)

Modulus of elasticity (kN/cm)

6900

Thermal conductivity [W/(m·°C)]

214

Longitudinal thermal expansion coefficient [mm/(m·°C)]

24×10

Melting point (°C)

650

Coating adhesion (grade)

0

Coating hardness (H)

≥1

Artificial aging resistance (h) (for outdoor use)

≥4000

 

Aluminum alloy plate design selection points

The fluorocarbon aluminum plate has two kinds of fluorocarbon sprayed plates and fluorocarbon pre-rolled coated aluminum plates.

1) Single-layer aluminum plate for curtain wall, the thickness of which should meet the requirements of the following table

Aluminum plate yield strength σ0.2 (N/mm)

<100

100≤σt<150

≥150

Aluminum plate thickness (mm)

≥3.0

≥2.5

≥2.0

2) The thickness of a single-layer aluminum plate is mainly considered for its strength, rigidity and flatness. The elastic modulus of different grades of aluminum plates is basically the same. When high-strength aluminum plates adopt 2.0mm plate thickness, the measures of reducing the spacing by using ribs should be adopted to ensure the rigidity and flatness.

3) Fluorocarbon spray plate

(1) Fluorocarbon spray coatings are divided into two coating systems, three coating systems and four coating systems. Generally, multi-layer coating systems should be used.

Two-coat system: consists of a 5-10 μm fluorocarbon primer and a 20-30 μm fluorocarbon topcoat, which can only be used in general environments.

Three-coating system: consisting of 5-10 μm fluorocarbon primer, 20-30 μm fluorocarbon paint and 10-20 μm fluorocarbon varnish. It is suitable for severe environmental pollution, industrial areas and coastal areas.

Four-coat system: There are two types of four-coat system. One is to add a 20μm fluorocarbon intermediate paint between the primer and the top coat when using large-particle aluminum powder pigment; the other is to add a polyamide and polyurethane blend between the primer and the top coat. The dense coating improves the corrosion resistance and increases the service life of the fluorocarbon aluminum plate. Because the general fluorocarbon paint is a sponge structure with pores, it cannot prevent the positive and negative ions in the air from penetrating freely to the base of the metal plate. Therefore, this coating system is more suitable for severe environmental pollution, industrial areas and coastal areas.

(2) Curing of fluorocarbon baking varnish: It should be baked with a few coats to make each layer of lacquer completely cured, forming good adhesion, corrosion resistance and fading resistance, avoiding more baking and less baking.

(3) When selecting fluorocarbon lacquered aluminum panels, attention should be paid to the brand and main technical indicators of fluorocarbon lacquer, and the fluororesin content should be ≥ 70%.

4) Fluorocarbon pre-roll coated aluminum sheet

(1) The design concept of pre-rolled aluminum sheet is to combine as many material advantages and process advantages as possible, to minimize the quality factor of human influence, and its quality is more guaranteed than fluorocarbon spray (paint) aluminum sheet.

(2) The fluororesin content can be up to 80%.

(3) The thickness of the coating is generally 25 μm.

 Aluminum alloy sheet, aluminum alloy rod, aluminum sheet

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