Hose clamps are generally used in hoses, and the influencing factor of the service life is often considered the rust and corrosion resistance of hose clamps. In order to solve these problems, hose clamp manufacturers often produce stainless steel hose clamps. In order to enhance the rust and corrosion resistance of the hose clamp, the surface of the hose clamp is often plated with a coating. Faced with various materials and coatings, how to choose a hose clamp suitable for our coating type to achieve the highest effect?

Carbon steel hose clamp vs stainless steel hose clamp

There are two types of hose clamp : carbon steel hose clamp and stainless steel hose clamp. Carbon steel refers to an iron-carbon alloy with a carbon content of less than 2.11%. It is also called carbon steel. Its hardness is much higher than that of stainless steel, but its weight is relatively large and its plasticity is low. Rusty. Stainless steel is mixed with a large number of other alloys, and the price is more expensive than carbon steel.

Common hose clamp coating

The stainless steel throat hoop itself contains alloy elements, which can be oxidized to form a passivation layer, and the passivation layer is dynamic. Therefore, stainless steel has relatively good corrosion resistance. According to RoHS and REACH standards, chromium (VI) must not be used for coating. Carbon steel is usually galvanized. The coating of hot-dip galvanizing is thick, and the electroplating is relatively thin, and there is a big gap in corrosion resistance.

Why can carbon steel galvanized prevent corrosion?

Zinc has high activity and plays a cathodic protection after contact with metal. The passive film formed by self-passivation on the surface of stainless steel will reduce the cathodic protection of zinc. Therefore, zinc coating is not generally used for stainless steel.

Can increase the coating of stainless steel hose clamps to improve corrosion resistance?

Yes. Due to long-term exposure to harsh environments, stainless steel will inevitably corrode. The corrosion of stainless steel is divided into general corrosion and local corrosion. The overall corrosion of stainless steel can be predicted by data. Moreover, total corrosion is a gradual process and can be prevented in advance. However, the local corrosion process is unpredictable, and relatively speaking, the potential harm caused by it is greater. In order to ensure the safe and normal operation of stainless steel equipment and components, effective anti-corrosion measures must be taken.

The surface of stainless steel is relatively smooth and has a passivation layer. For this reason, the choice of stainless steel surface coating is different from carbon steel and low alloy steel. After installation, the surface of the hose clamp can be painted. For example, the surface of the stainless steel hose clamp in the petrochemical industry is coated with epoxy zinc phosphate primer, which shows good adhesion. However, because zinc phosphate is slightly soluble in water, for the immersion environment, especially the working conditions accompanied by high temperature, try not to use the primer containing zinc phosphate. In the immersion environment, the corrosion rate will increase. Phenolic epoxy paint and vinyl ester resin paint can be used.

When the coating scheme is selected, the resistance performance of the coating must meet the requirements of use, and the actual construction performance and cost of the coating must also be considered.

Regular inspection is necessary

Regularly check the hose clamps for deposits of dust and other substances, especially the hose clamps of large machinery such as ships, which can be cleaned by washing with water to avoid corrosion, especially the location of joint parts. If damage such as cracks is found, it should be replaced in time to avoid leakage.

Source: Kingsun