Analysis on the influence of hot dip galvanizing pickling process

The appearance of hot galvanizing technology is a great progress in human history, and it has played a very important role in steel corrosion prevention. The anti-corrosion time of traditional steel structure products is only about 30 years, far from reaching the life required by the construction. The invention of hot dip galvanizing is to extend the life of steel structure products to more than 50 years, greatly improving the quality and service life of steel structure products. With the promotion and popularity of the hot galvanizing technology around the world, people have a deeper understanding of the importance of hot dip galvanized, along with the market and the scale expands rapidly, hot galvanizing production for environmental pollution, the damage to human body health, the workshop, equipment corrosion, waste acid discharge and treatment, rinsing water discharge and treatment, etc., has become the restriction enterprise a stumbling block to the development of environmental protection. Whether hot galvanizing can improve and reduce pollution environment has become an important research content of impact report.

Here, I will tell you about the analysis and research of hot-dip galvanized pickling

1. The commonly used pickling materials are made of hydrochloric acid or sulfuric acid, which can be used to completely clean the oxides on the surface of steel. Its reaction formula is: fe203+HCI=FeCl+H20, fe203+ H2S04+H20

2. Traditional hot-dip galvanizing pickling process: put iron and steel products or materials in code or bolt on fixed tooling, arbitrarily put them into the diluted pickling tank, until the surface oxides are removed clean, enter the rinsing tank to remove the iron salt and residual acid on the surface of the workpiece as far as possible, and then enter the next process (zinc aid). We see the results of acid pickling process, after the pickling over a period of time, pickling efficiency will become more and more low, gradually cannot satisfy the user's production requirements, then some companies will add salt concentration is higher to increase the rate of acid pickling, and some will choose to direct emissions fall, such not only increased the cost also pollute the environment.

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