How to prevent corrosion of aluminum alloy? Is aluminum alloy corrosion resistant

1. Structural change method.

For example, the manufacture of various corrosion-resistant alloys, such as adding chromium and nickel to ordinary steel to make stainless steel.

2. Protective layer method.

A protective layer is applied to the surface of the metal to isolate the metal products from the surrounding corrosive medium, thereby preventing corrosion. Such as:

1) Coat the surface of steel parts with oil, petroleum jelly, paint or cover enamel, plastic and other corrosion-resistant non-metallic materials.

2) Plating with electroplating, hot plating, spraying and other methods to coat the surface of steel with a layer of metals that are not easy to be corroded, such as zinc, tin, chromium, nickel, etc. These metals are often oxidized to form a dense oxide film that blocks corrosion of steel by water and air.

3) Use chemical methods to form a fine and stable oxide film on the surface of steel. For example, a fine black iron oxide film is formed on the surface of machine parts, guns and other steel parts.

3. Deal with corrosive media.

Eliminate corrosive media, such as frequent cleaning of metal equipment, placing desiccant in precision instruments or adding a small amount of corrosion inhibitor to the corrosive medium that can slow down the corrosion rate.

Methods of anti-corrosion of aluminum alloy:

1. Surface grinding and polishing.

2. Surface sandblasting and shot blasting treatment.

3. Surface wire drawing treatment.

Aluminum alloy is the most widely used non-ferrous metal structural material in industry, and has been widely used in aviation, aerospace, automobile, machinery manufacturing, shipbuilding and chemical industries. The rapid development of the industrial economy, welding of aluminum alloys.

The increasing demand for structural parts has led to the deepening of the weldability research of aluminum alloys. At present, aluminum alloy is the most widely used alloy.

The degree of corrosion resistance of aluminum alloys depends on the stability of the oxide film in different environments. In a dry atmosphere, the passivation film is not easy to be destroyed and is stable. Long-term exposure to outdoor atmospheric conditions can cause local pitting erosion.

This is mainly due to the formation of an anoxic zone on the metal surface in the water film under the dust ions after the deposition of dust ions on the surface, resulting in the destruction of the passivation film and the reduction of self-passivation ability. In the industrial atmosphere, the protective film is easily damaged, and the corrosion resistance decreases, especially in areas polluted by sulfur oxide acid rain. The front of the aluminum is generally blackened, which is black with white spots or gray-white with black spots.

In the ocean atmosphere, Cl- has a strong destructive effect on the passivation film.

The blunt state of aluminum alloy in seawater is unstable, and local corrosion is its main form of corrosion. Common localized corrosion is porosity and crevice corrosion. Pure aluminum does not produce intergranular corrosion, and aluminum alloys have greater susceptibility to intergranular corrosion.

Stress corrosion occurs mainly in heat-treated, high-strength aluminum alloys, and is of the intergranular cracking type.

When aluminum alloys come into contact with most metals in seawater, they are anodized, which accelerates aluminum corrosion. Aluminum alloy is also said to be the heaviest corrosion in the full immersion area, the lightest in the splash area, and the middle in the tidal range area. In the total immersion zone or tidal range zone, the surface of the marine life is more fouled than other metals, which will exacerbate the local corrosion of the aluminum alloy.

In an industrial environment, the average corrosion rate of aluminium alloys over a 20-year period is about 1 mA. In different corrosive environments, the average pitting degree of aluminum alloy in 20 years is much more serious, and the data are as follows: 10 55 m in rural environment; urban environment 100 190 m; Marine environment 85 260 m.

When aluminum comes into contact with metals such as steel, copper and stainless steel, there is a risk of galvanic corrosion. Therefore, aluminum and these metals are insulated from each other.

Aluminum alloy contains magnesium and 1% manganese, which is called seawater-resistant aluminum alloy, which has good corrosion resistance in the marine environment. This aluminum alloy is mostly used for antifouling paints that do not contain cuprous oxide. Because the antifouling paint with cuprous oxide as the main antifouling agent is in contact with the aluminum alloy hull, it will cause corrosion of the hull due to galvanic interaction.

Aluminum alloy can be treated with different surface treatments to achieve a more durable and corrosion-resistant profile.

The main methods of surface treatment include anodizing, electrophoretic coating, electrostatic spraying, fluorocarbon spraying, wood grain transfer, wire drawing and so on.

First of all, it depends on what kind of product you are talking about aluminum alloy, and its post-processing requirements, can not be generalized, if it is not anodized, in the short term (3-4 months) can be treated with aluminum alloy anticorrosive fluid, and the long time (1-3 years) can be passivated.

Anodized and then dehydrogenated.

Anodizing + blocking treatment.

Methods of anti-corrosion of aluminum alloy:

1. Surface grinding and polishing.

2. Surface sandblasting and shot blasting treatment.

3. Surface wire drawing treatment.

Aluminum alloy is the most widely used non-ferrous metal structural material in industry, and has been widely used in aviation, aerospace, automobile, machinery manufacturing, shipbuilding and jujube preparation industry. With the rapid development of the industrial economy, the demand for aluminum alloy welded structural parts is increasing, which makes the research on the weldability of aluminum alloy also deepen. At present, aluminum alloy is the most widely used alloy.

<> "Aluminum alloy is a more common material in life, and there are many aspects that need to be paid attention to when using and processing. So, is aluminum alloy corrosion resistant? How many ways to treat the surface of aluminum alloy being oxidized?

Is aluminum alloy corrosion-resistant

It is inherently corrosion-resistant, and its performance in this regard is very low, and it is easy to get stained during use. Therefore, for this material, it needs to be specially oxidized during processing, so as to have good corrosion resistance, and can also have wear resistance and other characteristics.

There are several ways to treat the surface of aluminum alloy to be oxidized

1. After the surface of the aluminum alloy is oxidized, it can show more obvious advantages, and the oxidation of the aluminum surface can be accelerated by hot water washing. For example, the surface of the aluminum alloy is washed with hot water, so that the mulch layer can achieve the purpose of aging, but when using hot water, it is necessary to pay attention to the water temperature, which is controlled at about 40 degrees to 50 degrees, and the washing time is normally around one minute.

2. Use a cotton towel to absorb all the moisture on the surface of the aluminum alloy, and then put it in a ventilated place, which can make the aluminum air dry naturally, and will not affect the color of its surface.

3. You can also use the drying method to place the Ant Douhui aluminum alloy in the oven to dry, and wait until its surface is dried. However, it is necessary to pay attention to the drying time, which is normally about 10 minutes, and also strictly control the temperature of the oven, otherwise it will damage its surface material.

What are the benefits of aluminum alloys after oxidation

It forms a protective film by itself after oxidation, and the stability of this protective film is very good, and it also has a certain corrosion resistance, and the service life will be extended. At the same time, it will become more beautiful, especially for those with more stunning patterns, it will show richer colors.

Prevent from the source, use aluminum alloy special cutting fluid to process products.

In the cleaning process, a special degreaser for aluminum-zinc alloy is used for degreasing and anti-corrosion.

For the products that have been shouted for a while, aluminum pickling can be carried out to save them.

Hello dear, The following is my answer to your question; 1.The edges of the door and window frames can be protected by rubber-type anticorrosive coating or polypropylene resin protective decorative film, and plastic film can also be pasted to protect the source state, so as to avoid the electrochemical reaction between the caulking cement mortar and the surface of aluminum alloy doors and windows in direct contact with them, and corrode aluminum alloy doors and windows. 2.

If the connecting iron parts are used to fix the aluminum alloy doors and windows during installation, the iron parts should be cracked and anti-corrosion treatment, and it is best to use stainless steel fixings or hot-dip galvanized fixings. 3.Aluminum alloy doors and windows with steel sub-frame requirements, the production materials of steel sub-frames should be welded with hot-dip galvanized materials, and the cold wind should be full and painted with anti-corrosive paint and anti-rust paint.

4.The screwing between the aluminum alloy frame and the steel sub-frame should be screwed with stainless steel screws. 5.

Door and window hardware should be made of stainless steel as much as possible, the connection between the hardware and the window frame and the window sash should be connected by stainless steel screws, and the assembled hardware should be oiled, and the oiling plays a role in lubrication and anti-corrosion.

The corrosion resistance of aluminum alloy is not strong, and it is easy to be stained.

Therefore, aluminum alloy parts usually undergo special oxidation treatment, so as to obtain artificial films with good properties such as corrosion resistance and wear resistance.

There are five commonly used oxidation treatment methods:

Anodizing.

Chemical oxidation.

Micro-arc oxidation method.

Rare earth conversion film method.

Laser cladding method.

In addition to oxidation treatment, you can also add coatings, and the methods are:

Electroless plating.

Thermal spray treatment.

Selection and development trend of aluminum alloy anticorrosive coatings.

The advantages of aluminum alloy parts are their small specific gravity, strong electrical and thermal conductivity, excellent mechanical properties, good machinability, etc., but the oxide film formed by itself is difficult to resist the corrosion of the application environment, and its corrosion resistance must be improved through appropriate surface treatment.