How to polish aluminum diamond plate?

How to polish the aluminum diamond plate? The answer is that there are usually three methods of mechanical, chemical, or electrochemical. Among them, chemical and electrochemical polishing methods are more common, which will be introduced below. The polishing process can reduce the surface roughness of the aluminum plate to obtain a bright and smooth surface, giving a high-end and simple feeling.

Introduction to polishing principle of aluminum plate

The chemical polishing of aluminum plates is a solution based on 70% (mass percentage) of phosphoric acid. Commonly used is a mixture of phosphoric acid, nitric acid, and sulfuric acid. When the alloy composition changes, the sulfuric acid content (mass percentage) is between 9%-15% The content of nitric acid (mass percentage) varies between 3% and 9%. At the same time, an S-type acid copper brightener is used as an additive on the basis of a mixture of phosphoric acid and sulfuric acid. This yellow smoke-free chemical polishing is suitable for pure aluminum or aluminum Magnesium alloy, and it is still the mainstream formula.

Firstly, when the aluminum plate is immersed in hot concentrated acid, a strong acid etching reaction occurs, and a layer of the aluminum plate on the surface of the aluminum plate is dissolved and removed. At this time, the additives in the polishing solution inhibit the acid etching reaction and an oxidation reaction occurs. The passivation of a layer of aluminum oxide board with a thickness of dozens of atomic layers is covered on the surface of the aluminum plate, producing a passivation effect, and the surface of the aluminum plate is temporarily maintained.

Then the oxide film is continuously dissolved by acid, then passivated, and then dissolved again. The convex part is continuously leveled and the concave part reaches the same plane. At this time, the polishing goal is achieved. This is the essence of how to polish aluminum diamond plate.

What problems should be paid attention to when polishing aluminum plate

Know how to polish aluminum diamond plate, but also know some points that need attention.

1. It is necessary to pay attention to the problem of chemical agents. It is necessary to plan 70% of phosphoric acid, and it is also necessary to add 3% of nitric acid and sulfuric acid internally. After the proportioning is completed, continuous stirring is required, and it will not be until complete blending. May wish to proceed.

2. It is necessary to pay attention to the polishing environment and it should be carried out in a clean form. Otherwise, it is easy to cause rust problems after chemical spraying. Only in clean conditions can we prevent this problem from occurring.

3. Pay attention to the process of manipulation and must comply with the requirements for handling. More and more workers, need to wear protective equipment to avoid affecting their own safety.

4. Pay attention to the inspection after the operation. After the aluminum plate is polished, it is necessary to inspect it to prevent missing parts and ensure that each place is processed before it can be placed.

How to protect the aluminum plate after polishing?

First of all, do not clean the hot board (when the temperature exceeds 40 °C), because the rapid evaporation of water is harmful to the paint!

Secondly, when it can be cleaned, please choose a suitable detergent. A basic principle is: you must choose a neutral detergent! Please do not use strong alkaline detergents such as potassium hydroxide, sodium hydroxide, or sodium carbonate, strong acid detergents, abrasive detergents, and paint-soluble detergents.

In addition, the storage environment of the polished aluminum plate should be dry, bright, ventilated, and non-corrosive. It is forbidden to store it with chemical data and wettability data. The bottom of the aluminum plate should be separated from the ground with a spacer, and the distance from the ground should be greater than 10CM; large standard data When stacked together, it is recommended to separate the top and bottom with wood strips/planks and other materials. In the process of handling the aluminum plate, it is necessary to handle with care, beware of lumps, and bumps on the surface, which will affect the appearance.


Concluding remarks

The aluminum diamond plate substrate products produced by Mingtai for polishing are widely used in building curtain walls, refrigerators, and freezers, automobiles, or aerospace industries. The products are exported to Europe, America, and Southeast Asia countries, and are sold to more than 200 large and medium-sized enterprises across the country. I believe that MIngtai’s products are added. As explained in the previous article about how to polish aluminum diamond plate, the performance of the product will be greatly improved.