Ordinary temp. parkerizing liquid

Abstract

An ordinary-temp phosphating liquid for the phosphate treatment of surface of iron and steel contains phosphoric acid (2-4 wt.%), zinc oxide (0.4-0.6 wt.%), zinc nitrate (0.5-1.5 wt.%), nickel nitrate (3-5 wt.%), manganese nitrate (2-4 wt.%), sodium borofluorate (0.2-1 wt.%), sodium chlorate (2-3 wt.%), citric acid (0.5-2 wt.%), and softened water (the rest). Its advantages are high stability, long film-forming time, and high film strength and resistance to corrosion.

Description

(1) Technical field [0001] The invention belongs to the technical field of surface chemistry, and particularly relates to a normal temperature phosphating solution for phosphating the surface of steel. (2) Background technology [0002] For phosphating treatment of steel surface, the traditional phosphating solution has high temperature, high energy consumption, long time and high cost. Especially for large workpieces such as automobile chassis and parts, it is difficult for some small and medium-sized enterprises to carry out medium and high temperature phosphating. For example, Chinese patents CN1076225 and CN1077757 disclose two kinds of blackening liquids and their processes for step-by-step treatment. Although the step-by-step treatment can obtain a black phosphating film, the film formation is relatively loose, and the process is long and the cost is high. For example, Chinese patent CN1231705 discloses phosphating liquid and its process. The operating temperature is ...

AI Technical Summary

Problems solved by technology

[0002] Phosphating treatment of steel surface, traditionally used phosphating solution has high temperature, high energy consumption, long time and high cost

Especially for large workpieces such as automobile chassis and parts, it is difficult for some small and medium-sized enterprises to carry out medium and high temperature phosphating.

For example, Chinese patents CN1076225 and CN1077757 disclose two kinds of blackening solutions and their processes for step-by-step treatment. Although black phosphating film can be obtained by step-by-step treatment, the film formation is relatively loose, and the process is long and the cost is high.

For example, Chinese patent CN1231705 discloses phosphating solution and its process. The operating temperature is 15-75 degrees, the cost is relatively high, the film forming time is long, the film forming is loose, and the corrosion resistance is poor. It is not suitable for working in a harsh environment like an automobile chassis. the workpiece