Are galvanized materials "afraid of the cold"?

Extreme cold weather refers to extremely cold weather with extremely low temperatures, usually tens of degrees below zero. This kind of weather conditions is very harsh, often accompanied by blizzards, ice, frost and other phenomena, which have a great impact on people's production and life. For the galvanizing industry, extreme cold weather will also have many effects on galvanized materials, mainly manifested in low-temperature embrittlement, reduced tensile strength and yield strength, reduced cold bending performance, reduced impact toughness and corrosion rate of galvanized materials. Impact, etc.

1. Low-temperature embrittlement: Extremely cold weather will cause the temperature of galvanized materials to drop to a very low level, causing the material to become more brittle. In low temperature environments, the toughness of galvanized materials decreases and brittle fracture is prone to occur.

2. Reduction in tensile strength and yield strength: Under low temperature conditions, the tensile strength and yield strength of galvanized materials will decrease. This means that in extremely cold weather, galvanized materials may not be able to withstand normal external forces and may easily deform or break.

3. Decrease in cold bending performance: Extreme cold weather will reduce the toughness of galvanized materials, resulting in a decrease in cold bending performance. Under low temperature conditions, galvanized materials may not be able to undergo normal cold bending operations, or may be prone to cracking or deformation during the cold bending process. 4. Reduced impact toughness: Extreme cold weather will reduce the impact toughness of galvanized materials, making them more likely to crack or deform when impacted.

In addition, extremely cold weather also has an impact on the corrosion of galvanized materials, mainly reflected in wet corrosion and cold corrosion.

In extreme cold weather, galvanized steel may suffer from wet corrosion. Wet corrosion occurs when curing, shrinking water. At this time, the shrinkage water on the steel surface is thicker, and the speed of oxygen diffusion outside the steel surface will be slower, thus reducing the erosion rate.

On the other hand, galvanized steel sheets may suffer from cold corrosion in ambient air with air humidity greater than 30% and less than 100%. In this case, there is dust on the surface of the steel, and there are micropores and gaps in the rust layer, which cause microscopic absorption and produce invisible shrinkage water. The principle of producing galvanic cells in shrinking water makes the etching speed relatively fast.

Therefore, when using galvanized materials in extremely cold weather, corresponding measures need to be taken to improve its low temperature resistance and corrosion resistance to adapt to the environmental requirements of extremely cold weather. The main protective measures are:

1. Regular inspection: Regularly check the surface condition of galvanized materials to ensure there are no cracks, rust or other damage. If any problems are found, take prompt repair measures.

2. Coating protection: Apply a layer of anti-rust coating on the surface of galvanized materials to enhance its corrosion resistance. Choose coating materials with good weather resistance and low temperature resistance.

3. Avoid water accumulation: In extremely cold weather, avoid water accumulation on the surface of galvanized materials. Water will accelerate the corrosion process, so remove accumulated water promptly and keep the surface dry.

4. Avoid direct contact with ice and snow: Avoid direct exposure of galvanized materials to ice and snow. The salt and chloride ions in ice and snow will accelerate corrosion. If exposure to ice and snow is necessary, minimize exposure time and remove ice and snow promptly.

5. Maintain ventilation: Maintain good ventilation around galvanized materials to avoid the accumulation of moisture and corrosive gases.

6. Regular maintenance: Regular maintenance and maintenance of galvanized materials, including cleaning, lubrication and tightening operations, to ensure their normal operation and extend their service life.