1. Interval time

If the interval between each production process is too long, it will cause secondary rusting of the q345b square pipe during the entire operation process. Especially when there is a pickling process, the pipes after phosphating treatment are easy to oxidize, rust, and turn green in the air. Providing water conservation maintenance during the production process can reduce rust.

2. Heating tube of pickling equipment

Although the selection of raw materials for pickling equipment heating tubes is not part of the production process, if no reminder is given, it may cause the industrial equipment design staff to be careless. Fiberglass, marble, and plastic are the only raw materials for pickling equipment for sulfuric acid and hydrochloric acid phosphating treatment. The heating tubes can only use lead-antimony alloy tubes and ceramic tubes, but stainless steel plates cannot be used.

3. Making process holes

For square pipes prone to blind spots and water accumulation, try to choose appropriate locations to drill production holes to ensure that the water can flow out adequately in a short period. Otherwise, it will cause stringing or long-term draining in the air, causing secondary rust and affecting the expected effect of phosphating treatment.