Can Carbon Steel Meet the Requirements of C5-M?
C5-M is a standard for surface coating systems [according to ISO 12944].
What does stainless steel C5-m mean (what size is C5)?
Surface corrosion protection technology (for ships)
Application object: Steel [Carbon steel of course].
What Is The Concept of Corrosion Protection Class C4-M?
Industrial areas, coastal and chemical plants, and other places with high pollution or salt spray are considered to belong to C4 environments.
Most public facilities, such as stadiums, exhibition centers, etc., are in C2-C4 environments. High-corrosion C5-I and C5-M steel structures are usually metallurgical and petrochemical enterprises and marine engineering steel structures. Highly severe corrosion environment, that is, C4 (high).
C5-I (very high industrial) and C5-M (very high marine) corrosion environments, corrosion protection in these environments is considered severe corrosion, for severe corrosion, Beijing Zhisheng Weihua Chemical Co., Ltd. has been at the forefront of the world after more than ten years of research and development.
Expanded Information-Methods Of Metal Anti-Corrosion
For the cause of metal corrosion to take appropriate methods to prevent metal corrosion, commonly used methods are:
Structure Change Method
For example, the manufacture of a variety of corrosion-resistant alloys, such as adding chromium and nickel to ordinary steel made of stainless steel.
Protective Layer Method
The metal surface is covered with a protective layer so that the metal products and the surrounding corrosive medium are isolated to prevent corrosion. Such as:
1, On the surface of steel parts coated with motor oil, petroleum jelly, paint or cover enamel, plastic, and other corrosion-resistant non-metallic materials.
2, With electroplating, hot plating, spray plating, and other methods, the steel surface plated with a layer of metal is not easy to corrode, such as zinc, tin, chromium, nickel, and so on. These metals are often oxidized to form a layer of dense oxide film, thus blocking water and air corrosion of steel.
3, With chemical methods to generate a layer of fine and stable oxide film on the surface of steel. Such as machine parts, guns, and other steel parts on the surface of the formation of a layer of fine black iron tetraoxide film.
Electrochemical protection method
The use of the principle of the primary cell to protect the metal, trying to eliminate the cause of galvanic corrosion of the primary cell reaction. The electrochemical protection method is divided into anodic protection and cathodic protection of two categories, the application of more is the cathodic protection method.
Can 304 Stainless Steel Meet The Corrosion Resistance Standard Of C5-M?
The corrosion resistance is directly related to the environment in which the product is used, whether it is used in a general environment or an acidic environment. The parameters of measurement are not clear, it is difficult to compare.
This is the reason why the neutral salt spray test is widely accepted. We are more familiar with the standards, such as ASTM A276, ASTM A240, JIS G4305, and JIS G4303 have not labeled the salt spray test time of NSS, it can be seen that the NSS should not be used to evaluate the corrosion resistance of 304 stainless steel crews parameter.
The key is the material, the material in the nickel, chromium content is in line with the requirements, and whether the impurity elements are properly controlled. Another key point is passivation. Now the general production of stainless steel sCrews is simply “wash light”, not by the requirements of ASTM A380 passivation.