Performance analysis of antirust alloy aluminum plate

Al-Mg alloy and Al-Mn alloy are collectively referred to as antirust alloy aluminum plates, because the alloy composition between them increases their corrosion resistance. Representatives of Al-Mn alloys are 3003, 3004 and 3105. The first one is widely used, the latter one is usually used for cans, and the third one is used for wires and other surfaces with high electrical conductivity requirements. According to the content of magnesium alloys, aluminum-magnesium alloys are 5005, 5252, 5251, 5050, 5052, 5754, 5083, 5056 and 5086, which are used in shipbuilding, containers, subway high-speed trains and so on.

It mainly includes al-Mn and al-Mg alloys that cannot be strengthened by heat treatment. Rust-proof alloy aluminum plate with manganese content of 1.0% ~ 1.7% has high corrosion resistance, and the magnesium content of aluminum-magnesium rust-proof aluminum alloy is generally less than 7%. With the increase of magnesium content, the strength of the alloy increases, σ0 can reach 400MPa, and the plasticity decreases. This rust-proof aluminum alloy is usually used in annealing state, cold-working hardening state or semi-cold-working hardening state. Low strength, good plasticity, easy pressure processing, good corrosion resistance and good weldability, especially suitable for manufacturing deep-drawn parts, welded parts and parts working in corrosive media, such as oil tanks and pipelines. Another antirust aluminum alloy is Al-Zn-mg-Cu alloy, which can be strengthened by heat treatment. It has high tensile strength, excellent seawater corrosion resistance, good fracture toughness, low notch sensitivity and good molding process performance. Suitable for manufacturing seaplane skin and other strength sheet metal parts that need corrosion resistance and rust prevention. The alloy aluminum plate mainly contains alloy elements such as manganese and magnesium. Due to the effect of manganese, Al-Mn alloy has higher corrosion resistance and strength than pure aluminum, and has good weldability and plasticity, but poor cutting performance. Due to the effect of magnesium, the density of a-mg alloy is lower than that of pure aluminum, the strength is higher than that of Al-Mn alloy, and it has good corrosion resistance.

Analysis of design and installation technical points of alloy aluminum plate

(1) The layout of alloy aluminum plate is designed according to the drawing, with high dimensional accuracy.

(2) The alloy aluminum formwork system does not need skilled workers. After the template is manufactured in the factory, workers should be assembled in the processing factory in advance and trained. At the same time, workers or technicians should check whether there is still room for improvement.

(3) Alloy aluminum formwork and fittings have been completed. After being transported to the construction site and checked with the packing list, it can be classified, stacked and hoisted to the construction site according to the specific construction requirements. Every small accessory, connector and tool shall be properly stored and distributed when needed. The remaining templates and accessories shall be saved and registered for future modification, maintenance and replacement. There is no need for formwork yard or processing yard, as long as there is a small warehouse, which is suitable for projects with narrow construction site.

(4) Installation procedure and key points of alloy aluminum plate:

After each layer of concrete is poured, the levelness of the peripheral guard plate of the flat die shall be maintained first to maintain the verticality of the formwork; For the horizontal measurement and correction of concrete, if it is more than 8mm higher than the datum, it must be polished to the correct levelness; Pay-off shall continuously pass through the hole, outer corner, etc. for at least 150m, so as to control the correct position of the formwork before pouring. When the wall formwork is sealed with the beam bottom formwork, the supporting plate beam supporting the plate formwork shall be installed first, and then the plate formwork shall be installed. Generally, it starts from the corner, and then the mold release agent is painted after the installation. Each template has a number. As long as you are seated according to the number, the installation is modular and programmed, the installation quality is quite stable and the management is standardized.

(5) In order to facilitate the maintenance in the process of concrete pouring, the alloy aluminum plate system organically combines multiple independent systems such as wall formwork, top formwork and support to complete the overall assembly of formwork at one time and realize one-time pouring. When pouring concrete, check whether the pin steel wedge is loose, whether the bracket slides, whether the window cover plate is covered, and whether the pin and steel wedge are exposed to cause concrete overflow, so as to observe the changes.

(6) The template removal sequence and matters needing attention are generally non-bearing templates before bearing templates, and side plates before bottom plates. In general, the wall formwork can be removed after 12 hours and the floor slab can be removed after 36 hours, but the speed will be faster after calculation according to the specific conditions of the project.

Precautions for formwork removal: ① It is forbidden to place the alloy aluminum plate face down; Aluminum alloy formwork shall not be placed horizontally without collection and stacking; It is forbidden to use the formwork as a ramp, a bridge deck or a footboard. (2) aluminum template should be classified and reasonably stacked, and clearly marked, so that the next layer can be constructed as soon as possible. (3) collect small materials in time, otherwise it is easy to lose a lot. (4) the dismantled aluminum alloy template should be cleaned immediately, especially the floor template.

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