Precautions about galvanized wire production process during galvanizing and annealing

Annealing and galvanizing are very important steps in the production of galvanized wire products. Annealing is to ensure the cleanliness of iron wire, thereby improving the quality of galvanized wire. And galvanizing is the process to ensure anti-corrosion and anti-rust. This is the very important step in production that determines service life and usage of galvanized wire. Generally, after annealing, then there comes galvanizing. Still there are some tips we need pay attention to in these two processes: finishing steps well can ensure high standard in process of galvanized wire products, and it is also an important content that determines final high quality of successful production.

In addition, iron wire after wire drawing should be processed within three days. If it cannot be realized, wire drawing needs to be stopped automatically for a short time; the galvanized wire after annealing should be pickled with anti-rust before zinc coating; pickling and anti-rust iron wire should be zinc coated within 24 hours; the drawn iron wire has no oil on the surface after annealing, and unannealed iron wire is often filled with lubricating oil. Therefore, for galvanized wire after annealing, the operator should keep his hands clean and free of oil during galvanizing, and it is best to wear clean work clothes and gloves. The binding force of the zinc layer will decrease when the oily iron wire is zinced, and the zinc layer will easily fall off after zincing.

Galvanized wire is mostly pickled with hydrochloric acid. The concentration of hydrochloric acid is 20%, and the temperature is 30 degrees. The pickling liquid can be accompanied by a certain corrosion inhibitor. Then we should take it out within the specified time, and pickling time should be controlled in the specified process. Because excessive pickling will cause hydrogen embrittlement of galvanized wire, lower corrosive  resistance, and lower brightness.

Why is anti-rust treatment required in addition to galvanizing? This question is very confusing to many friends. It is because the surface of iron wire is easily oxidized to form oxides after pickling. Anti-rust treatment after pickling can prolong storage time of iron wire for zinc coating, and extend the traditional zinc coating time. At the same time, it can ensure that the bonding force between zinc layer and iron wire meets the requirements of the industry standard.