What to use to protect aluminum from corrosion
A metal such as aluminum and its alloys differ in excellent resistance to destruction of various types. But despite this, corrosion of aluminum is quite common. Different types of corrosion are the main cause of deterioration of these materials.
To combat the processes of destruction, it is necessary in any case to understand the conditions that are the reasons for their occurrence. Aluminum corrosion is a special reaction that takes place between the environment as well as the metal.
This process can be of both chemical and natural origin. The most popular type of metal destruction can be safely called the effect of the rusting process on its surface. For this reason, protection of aluminum against corrosion is required.
A feature of all types of metals can be called their characteristic to react with Н 2 О, and also the environment. The only difference for all types of metal is the intensity of this type of process.
For example, in precious metals like gold, the rate of this reaction will not be very fast, but iron, including aluminum, will react to the effects of this nature extremely quickly. There are a couple of factors that have a direct impact on the intensity of the corrosion process. One of them can be called the level of aggressiveness of the environment, as well as the chemical or metallurgical structure. The atmosphere that surrounds us is always characterized by a set moisture level. In addition, it will have a separate level of waste and pollution.
Given that atmospheric characteristics are often determined by region, as well as by the level of industrialization, at the moment it can be noted:
For a large number of cases, acids of the inorganic type, even at low concentrations, are ways to dissolve aluminum.
And even a film of natural origin of aluminum oxide is not a way to become sufficient protection against the appearance of corrosive processes. The most powerful solvents are potassium, fluorine and sodium. Moreover, aluminum is characterized by a fairly low level of resistance to bromine and chromium compounds. Cement and lime mortars will be quite aggressive to various alloys of aluminum metals.
Several types of corrosive aluminum and its alloys can be distinguished:
This type of destruction occurs most often and is less harmful than others. It is better to change it on the surface. This makes it possible to use protective means, and surface damage is extremely common on anodized profile for construction.
This type of corrosion is of intercrystalline and surface type. Destructions of this nature are extremely dangerous due to the fact that they are very difficult to detect. This type of corrosion very often destroys hard-to-reach parts of assemblies and structures.
Thread-like corrosion occurs in the weakened areas of damage to the organic coating or the edges of the holes.
Quite often, the natural anticorrosive properties of alloys and aluminum itself are extremely insufficient to protect against destruction. But the long operational period of products made of such metals, and it is imperative to apply additional methods of protection.
The most popular methods of protecting metals from corrosion include:
- Anodized oxidation (studies by specialists from Germany show that this type of protection is used 15% of the main production of building profiles in the world).
- Coating the metal surface with powder-type compounds.
- Protection against contact with other metals.
It is the anodized coating that can be a coating that creates a fairly strong aluminum oxide film on the surface of aluminum, which does not lend itself to aggressive environments. Such processing makes it possible to create a similar film layer on the surface of metals, which simply does not leave aluminum the opportunity to contact with the external environment and protects its sweat from oxidative processes.
On contact with other metals, aluminum and aluminum alloys, ways to form a galvanic pair. This contact can often lead to corrosion.
In order to avoid the occurrence of such processes, it is required to use fasteners on products made of such metal, which are made only of galvanized and stainless steel.
One of the most effective methods of anticorrosive protection of aluminum structures, as well as products from alloys, is surface coating by means of various paints and polymer types of compositions.The constant increase in demand for products and metal, as well as a huge range of colors for products made from such material will be the reason that the methods and techniques for applying such coatings are constantly improving and becoming perfect from the technological side.
Please note that modern materials used to apply a protective coating to the surface of aluminum are made from solvents, binders and dyes. Paints and varnishes that do not contain a solvent are called powder paints, and those that still contain a solvent are called wet paints.
The painting methods used by modern manufacturing companies can be divided into:
- Coating on "wet surfaces" is carried out by using a two-component paint and varnish material with a hardener, which is often referred to as PUR-Lack DD paint in technical information on materials.
- Powder coatings that are applied by conventional spraying in one layer or even dry.
I would also like to note that aluminum itself has excellent characteristics of resistance to the corrosion process. But when in contact with electricity or other metals, it still undergoes various destructive processes. The best methods of protecting such a metal and its alloys will be considered anodizing and powder coating.
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