The phosphating process has been used in industry for more than 90 years and can be roughly divided into three periods:

1. Laying the foundation of phosphating technology

Phosphating film used as corrosion protection film for steel, the earliest reliable record is the patent obtained by Charles Ross in England in 1869. Since then, the phosphating process has been used in industrial production. During the long period of nearly a century, the phosphating process has accumulated rich experience and has made many major discoveries. During World War I, the development center of phosphating technology was transferred from the United Kingdom to the United States.

2, the rapid development of phosphate technology

In 1909, T.W.Coslet of the United States made zinc, zinc oxide or zinc phosphate dissolved in phosphoric acid to form the first zinc phosphating solution. This research result has greatly promoted the development of the phosphating process and broadened the development prospect of the phosphating process. Parco Power's formulated phosphating solution developed by Parker Rust Prevents many of the shortcomings and increased the phosphating time to lho. In 1929, the phosphating process of Bonderizing was shortened to 10 minutes. In 1934, the phosphating process achieved a revolutionary development in the industry. That is, a method of spraying phosphating solution onto a workpiece was adopted.

3, phosphating technology is widely used

Since the end of World War II, there have been very few breakthroughs in phosphating technology, but only steady progress and improvement. Phosphating is widely used in anti-corrosion technology, metal cold deformation processing industry. Phosphate treatment technology during this period important improvements are: low-temperature phosphating, a variety of methods to control the weight of phosphate film, continuous high-speed smelting steel. At present, the research direction of the phosphating technology is mainly focused on improving quality, reducing environmental pollution, and saving energy.