Effect of Passivation Treatment of Aluminum Plate on Adhesion and Corrosion Resistance of Aluminum Composite Panel

In the current state of environmental protection and energy conservation and fire safety, many public buildings choose to use aluminum veneer, Aluminum Honeycomb Panel, and aluminum energy-saving composite panels for interior and exterior decoration. Due to its good fire resistance, installation is fast and convenient and is increasingly recognized by the industry . Now the industry requires the use of integrated panels for construction and decoration, and aluminum products are energy-saving, recyclable and highly plastic, and can be combined with other materials into many decorative new products, such as honeycomb energy-saving integrated panels and stone honeycomb energy-saving composite panels. These materials can meet the requirements of beautiful decoration and high fire resistance. It can be said that there is still a large market for aluminum plates and their composite products. Aluminum Composite Panel is a composite material processed by chemically-treated coated aluminum plate as the surface material and polyethylene plastic or high mineral as the core material on special aluminum-plastic plate production equipment. The unique properties of the aluminum-plastic composite panel itself determine its wide range of uses: it can be used for building exterior walls, curtain wall panels, old building renovation and renovation, interior wall and ceiling decoration, advertising signs, display stands, purification and dust protection engineering. It belongs to a new type of building decoration material.

Aluminum Composite Panel

The dense inner layer can enhance the corrosion resistance of the aluminum plate surface, and the grid-like surface layer with polar groups can enhance the adhesion between the coating film and the aluminum plate and the adhesion between the adhesive film and the aluminum plate. The conversion mechanism of the commonly used chromium salt chromating agent is roughly: ① aluminum is corroded and dissolved in acidic solution; ② formation of Al2O3 oxide film layer; multi-salt compound film layer deposition.

After the surface is cleaned, it is stacked in the order of aluminum plate / Mg-9Li-1Zn alloy plate / aluminum plate to make a pre-rolled part. The pre-rolled part is covered with aluminum foil, and then quickly fed into the rolling mill for rolling and compounding. The experimental reduction ratio is 45% ~ 75%. The recrystallization temperature of Mg-9Li-1Zn alloy is about 300 ℃. Therefore, the annealing temperature of the solid super hard aviation aluminum rod is selected to be 260 ~ 340 ℃, and the annealing time is 1 ~ 4h.

If the equipment has low accuracy during the assembly process, the thin aluminum plate will be twisted in the width direction, and the formed thin aluminum plate will also have arc deformation along the direction of the circle center of the toothed roller due to fewer forming teeth. Therefore, both of these forming methods require further shaping of the formed product, and how to reshape the formed semi-honeycomb structure itself is a difficult problem.

If the aluminum plate is at normal temperature (25 ° C) before printing, after the previous printing and baking, the aluminum plate undergoes thermal expansion, and then the second printing is performed. The secondary printing pattern opposite the side gauge will shrink compared to the primary printing pattern phenomenon.

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