Jun 02,2022
How to store hardware tools to prevent rust
For metal products in hardware products, the primary situation in terms of storage work is anti-corrosion. Metal corrosion is caused by the chemical effect or chemical effect of surrounding substances. According to different materials, hardware tools are divided into atmospheric corrosion, soil layer corrosion, sea surface corrosion, germ corrosion and so on. Among them, atmospheric corrosion is more extensive. Because metal products are in contact with the atmosphere in the whole process of production, processing, transportation, storage and storage, there are always standards for atmospheric corrosion.
Habitually, the corrosion or discoloration of metals in the atmosphere due to oxygen, water and other environmental pollution residues is called rust or rust. After the metal products are corroded, it will damage the appearance quality in the lightest, and the application in more serious cases, and even lead to damage. Therefore, the hardware tools should be stored properly and pay attention to anti-rust treatment.
The primary factors that cause metal rust in hardware tools:
1) Atmospheric relative humidity
At the same temperature, the water vapor composition of the atmosphere is called relative humidity rather than the percentage of the water vapor saturated state composition. Below a certain relative humidity, the metal rust rate of hardware tools is not large, and after this relative humidity is higher, the rust rate increases suddenly. This relative humidity is called the critical value ambient humidity. The critical value ambient humidity for many metals is between 50% and 80%, and for steel it is about 75%. Atmospheric relative humidity is more harmful to metal corrosion. When the atmospheric humidity is higher than the critical value, the metal surface will shrink water or water droplets. If there are harmful residues in the atmosphere, the soil will shrink and the water droplets will become the lithium battery electrolyte, which will aggravate the corrosion.
2) Temperature and ambient humidity
The relationship between atmospheric temperature and ambient humidity is harmful to metal corrosion. This has the following key conditions: first, the water vapor composition of the atmosphere expands with the warming of the climate; second, the high temperature promotes the rust to aggravate, especially in the wet and cold natural environment, the higher the temperature, the faster the rust rate. When the relative humidity is low, the harm of temperature to rust is not significant, but when the temperature is higher than the critical value, the amount of rust expands greatly with the warming of the climate. In addition, if there is a temperature difference between the atmosphere and the metal, condensed water will be generated on the metal surface with a low temperature, which will also cause metal corrosion of hardware tools.
3) Corrosive gas
Corrosive gases in air pollution, such as sulfur dioxide, are more harmful to metal corrosion, especially for steel, copper and aluminum alloys. The key source of sulfur dioxide in the atmosphere is the ignition of coal. At the same time, igniting the substance carbon dioxide also has a corrosive effect. Corrosive gases are present in the atmosphere around the plant. Such as hydrogen chloride, nitrogen dioxide, sulfuric acid, etc. are all elements that promote metal corrosion.
In addition, if there is a temperature difference between the atmosphere and the metal, condensed water will be generated on the metal surface with a low temperature, which will also cause the hardware tools to rust.
4) Other elements
The atmosphere contains a lot of floating dust, such as thick smoke, fly ash, fluoride and other acids, alkalis, salt particles, etc., some of which are corrosive by themselves, or liquid water of water droplets, which are all rust elements of hardware tools. For example, fluoride is considered to be the 'enemy' of corroding metals".