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Why Does The Stainless Steel Of The Fire Truck Tank Rust?
- May 19, 2018 -

When brown rust spots appear on the surface of stainless steel, people are amazed: "stainless steel will not rust, rust is not stainless steel, it may be steel." In fact, this is a kind of one-sided wrong view of the lack of understanding of stainless steel. Stainless steel also rusts under certain conditions.

Stainless steel has the ability to resist atmospheric oxidation, which is not corrosive, but also has the capability of corrosion resistance in the medium containing acid, alkali and salt. But its corrosion resistance is changed by its chemical composition, mutual state, use condition and environmental media type. The 304 material, in a dry, clean atmosphere, has an excellent anti-corrosion capability, but moves it to the coastal area, where it will soon rust in the sea fog that contains a lot of salt. Therefore, not any kind of stainless steel, at any time can resist corrosion, not rust.

Stainless steel is formed on the surface of a layer of a very thin and fine and stable solid rich chromium oxide film (protective film), prevent oxygen to infiltration, continue to oxidation, nc micro letter number male cncdar and ability to resist corrosion. One but there is some reason, this kind of film is continuously damaged, air or liquid and oxygen atoms will constantly infiltration or metallic iron atom separation out unceasingly, forming loose iron oxide, metal surface rust by constantly. This kind of surface film is destroyed in many forms, many of which are seen in daily life:

1. The stainless steel surface of the fire truck can contain the dust of other metal elements or the attachment of other metallic materials, which is wet.

In the air, the condensate between the attachment and the stainless steel links the two together into a micro cell, triggering an electrochemical reaction.

Should, the protective film is damaged, call it electrochemical corrosion.

2. The stainless steel surface of the fire truck tank is adhered to the organic juice (such as melon, noodle soup, etc.), which is composed of water and oxygen.

Organic acid, long time to form organic acids to the metal surface corrosion.

3. The stainless steel surface of the fire truck can be caused by the adhesion of acid, alkali and salt substances (such as alkaline water and lime-water spray test).

Local corrosion.

4. In the polluted air (containing a large amount of sulphide, oxide, hydrogen oxide atmosphere), when the water is condensed,

Formation of sulfuric acid, nitric acid, acetic acid, causing chemical corrosion.

The above situation can cause the damage and corrosion of the stainless steel surface protective film used in the fire truck tank. Therefore, to ensure that the metal surface is permanently bright and not rusted, we recommend:

It is necessary to clean and scrub the stainless steel surface frequently, remove the attachment, and eliminate the external factors causing the rust.

There is a kind of stainless steel with 201 and 202 materials on the market, which is easy to rust in the coastal area, suitable for use in the absence of industrial pollution and air corrosion.

The beach area is made of 304 stainless steel, and 304 can resist seawater corrosion.