The coating method of ship anchor chain and the types of coatings commonly used
The ship's chain, anchors and chain lockers are often eroded by friction and seawater, and are prone to serious rust. Therefore, the coatings are required to be wear-resistant, seawater-resistant and rust-proof. The commonly used coating is coal tar pitch varnish, which is generally coated with 2~3 coats, and the dry film thickness is above 60μm. In the use of ships, it is found that the paint film falls off due to bumping and other reasons, and it needs to be repaired in time. In a dry environment, sand the edge of the old paint film with sandpaper to remove dust and dirt, and carefully apply the asphalt paint on the anchor chain by brushing. After 24 hours, apply the second coat, and it can take 5 days. During use, do not drag and stack the anchor chain that is not completely dry.
The surface treatment of newly-made anchor chains can be treated by shot peening or chemical pickling. Many shipyards use the rolling method to remove rust, tie the anchor chain with iron wire into a speed shape of about 3m long, put it into the drum, put steel wire forging, gold steel sand, iron chips, etc. in the drum, and use the motor to drive the drum to rotate. The anchor chain is hit by abrasives to remove rust. After removing the rust dust in the barrel and on the anchor chain, it can be painted. Generally, it can be hoisted into the dipping drum for dipping construction, and after 3-5min, it can be hoisted to dry. Shorter coating interval of 24h, generally 3 dips.
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