As an important structural component, magnesium forgings of construction machinery need to have good anti-corrosion properties and aesthetics during use. Therefore, the coating process and anti-corrosion protection measures are indispensable links. This paper will introduce the coating process and anti-corrosion protection measures of magnesium forgings of construction machinery in detail.
- Coating process
Coating process is an important means to ensure the appearance quality and anti-corrosion properties of magnesium forgings of construction machinery. The coating process includes surface treatment, primer coating, top coating and curing and drying. - Surface treatment: Before painting, the surface of magnesium forgings needs to be pre-treated. This process includes the removal of impurities such as oil, moisture, and oxides to ensure the coating layer is firmly bonded to the surface of the magnesium forgings. Common surface treatment methods include pickling, alkali washing, phosphating and sandblasting.
- Primer coating: primer is an important part of coating, which can improve the adhesion between the coating and the surface of magnesium forgings, and play a role in rust prevention and corrosion prevention. The selection of appropriate primer has an important influence on the coating effect and anti-corrosion ability. Common primers are epoxy primers, phenolic primers and polyurethane primers.
- Top paint coating: Top paint coating not only makes the painted surface more beautiful, but also provides additional anti-corrosion protection. According to the demand, you can choose a good weather resistance and corrosion resistance of the finish for painting.
- Curing and drying: After the coating is completed, it is necessary to cure and dry. By natural drying or using infrared baking, electric heating, etc., to ensure that the coating is fully cured, firmly attached, and good gloss.
Second, anti-corrosion protection measures
According to the characteristics and working environment of magnesium forgings of construction machinery, appropriate anti-corrosion protection measures can effectively extend its service life.
- Anti-corrosion coating: Choose the appropriate organic coating, inorganic coating or organic inorganic composite coating as the anti-corrosion layer. Organic coatings generally use epoxy resin, polyurethane and other coatings, inorganic coatings often use phosphating, galvanized and other processes. The organic inorganic composite coating combines the softness of the organic coating with the hardness of the inorganic coating, and has better anti-corrosion properties.
- Anode protection: anode protection technology is used to form a protective layer on the surface of magnesium forgings to achieve the purpose of anti-corrosion. Common methods include anodic oxidation and anodic chrome plating. Anode protection can increase surface hardness and corrosion resistance, effectively extend the service life of magnesium forgings.
- Hot coating treatment: By hot coating (such as zinc, aluminum, etc.), a dense and insoluble protective layer is formed on the surface of magnesium forgings, thus playing a role in anti-corrosion. Hot coating can reduce the corrosion rate and improve the corrosion resistance of magnesium forgings.
- Closed coating: Multi-layer closed coating is used to cover the surface of magnesium forgings to form a physical barrier to block the erosion of external air and water on magnesium forgings. This method can effectively reduce the corrosion and oxidation rate of magnesium forgings and improve its anti-corrosion protection ability.
In summary, the coating process and anti-corrosion protection measures of construction machinery magnesium forgings are important means to ensure their service life and appearance quality. In practical applications, we need to choose the appropriate coating process and anti-corrosion protection scheme according to the specific situation, while paying attention to the principle of environmental protection and resource utilization, to provide good protection for the long-term operation of magnesium forgings of construction machinery.
