According to different corrosion media, it can be divided into atmospheric corrosion, seawater corrosion, underground corrosion, bacterial corrosion, etc. Atmospheric corrosion is the most encountered in packaging engineering. Corrosion has serious damage to metal materials and products. According to the test, if the steel is corroded by 1%, its strength will be reduced by 5% to 10%, and the thin steel plate is more likely to lose its use value due to corroded perforation. The loss of metal products due to corrosion far exceeds the value of the materials used.
Therefore, in order to mitigate the loss caused by metal rust, the technical treatment of metal products using appropriate anti-rust materials and packaging methods to prevent corrosion during storage and transportation is anti-rust packaging technology.
Principles of anti-rust packaging technology
(1) Anti-rust oil anti-rust packaging technology. Atmospheric corrosion is the result of oxygen, Water vapor and other harmful gases in the air acting on the metal surface to cause electrochemical action. If the metal surface is isolated from various factors that cause atmospheric corrosion (that is, the metal surface is protected), the purpose of preventing atmospheric corrosion of the metal can be achieved. Anti-rust oil packaging technology is based on this principle to coat the metal to prevent corrosion.
Encapsulating metal products with anti-rust oil requires a certain thickness of the oil layer, good continuity of the oil layer, and complete coating. Different types of anti-rust oil should be coated by different methods.
(2) Gas-phase anti-rust packaging technology. Gas-phase anti-rust packaging technology is the technology of using gas-phase corrosion inhibitors (volatile corrosion inhibitors) to carry out anti-rust treatment on metal products in sealed packaging containers. The gas phase corrosion inhibitor is a substance that can slow down or completely stop the destruction process of metals in aggressive media. It is volatile at normal temperature. It evaporates or sublimes in a short time in a sealed packaging container The produced corrosion-inhibiting gas can fill every corner and gap in the entire packaging container, and at the same time be adsorbed on the surface of the metal product, thereby playing the role of suppressing the corrosion of the metal by the atmosphere.
Anti-rust packaging materials:
Current gas-phase anti-rust packaging materials include: gas-phase anti-rust film, gas-phase anti-rust bag, gas-phase anti-rust paper, gas-phase anti-rust wrapping film, gas-phase anti-rust desiccant, water-based anti-rust liquid, gas-phase anti-rust powder, etc .;
Anti-rust oil: thin layer anti-rust oil, wax film anti-rust oil, water-soluble anti-rust oil, volatile anti-rust oil, replacement anti-rust oil, sealed anti-rust oil, etc.
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