Phosphatization liquid for unvarnished iron pipes of window guardrails

Abstract

The invention discloses a p hosphatization liquid for unvarnished iron pipes of window guardrails. The phosphatization liquid comprises 20-24 g/L of zinc oxide, 15-19 g/L of manganous dihydrogen phosphate, 40-44 g/L of phosphoric acid with the concentration of 85%, 14-20 g/L of hydroquinone, 6-10 g/L of tartaric acid, 2-6 g/L of citric acid, 1-2 g/L of nickel nitrate, 1-3 g/L of sodium fluoride, 1-3 g/L of sodium nitrite, 1-2 g/L of sodium chlorate, and the balance water.

Description

technical field [0001] The invention relates to the technical field of surface treatment, in particular to a phosphating solution for iron pipes used for window guardrails before painting. Background technique [0002] As we all know, ordinary steel is easy to generate a kind of loose rust in the atmosphere due to various impurities, which will intensify the corrosion of the substrate. Previously, it was treated chemically or electrochemically to form a dense and continuous phosphating film on the metal surface, laying a good foundation for further painting and other treatments of the metal. [0003] At present, the pretreatment commonly used in the market is sandblasting technology and phosphating solution mainly suitable for steel, and the phosphating solution includes bathing solution and replenishing solution. The pre-treatment stage of the sandblasting process refers to the treatment that should be carried out on the surface of the workpiece before it is sprayed and sp...

AI Technical Summary

Problems solved by technology

The quality of the pre-treatment of the sandblasting process affects the adhesion, appearance, moisture resistance and corrosion resistance of the coating. If the pre-treatment is not done well, the rust will continue to spread under the coating, making the coating Layers fall off

For phosphating treatment on the surface of steel, the traditional phosphating solution has high temperature, high energy consumption, long treatment time, and high cost. Especially for the treatment of iron pipes for window guardrails, etc., usually self-employed or For small and medium-sized enterprises to operate this kind of business, if high-temperature phosphating is used, it is indeed difficult for some small and medium-sized enterprises.

However, even if the normal temperature phosphating solution is used, most of them still need a certain temperature, the fusion speed is slow, and the operating environment is harsh. During use, toxic gases or sediments will be generated, which will affect the environmental quality.

In recent years, there are also reports on the normal temperature phosphating solution in the market, but the treatment time is too long during use, and its acidic substances corrode the steel surface greatly, and if it is not serious, it will affect the phosphating quality