Substitutive treatment agent for metal surface phosphating and preparation method thereof

Abstract

The invention discloses a substitutive treatment agent for metal surface phosphating and a preparation method thereof, and relates to the metal surface treatment technology. The substitutive treatment agent for phosphating consists of the following components of: gamma-APS, anhydrous alcohol, fluozirconate and de-ionized water, wherein the substitutive treatment agent for phosphating consisting of the components is a silane and nanoceramic composite film; the preparation method for the silane and nanoceramic composite film which consists of the components and is used for pre-treating the metal surface comprises the following steps of: rinsing with hot water; degreasing in advance; rinsing for the first time; rinsing for the second time; rinsing for the third time; performing phosphate-free conversion; rinsing a straight bar; rinsing for the fourth time; rinsing for the fifth time; and finishing the preparation. The substitutive treatment agent and the preparation method have the advantages that: the silane and nanoceramic composite film does not rust in 48 hours after being formed on the metal surface of a cold rolled steel sheet and the like and naturally cooled so as to meet the requirement on corrosion resistance in the production process; and meanwhile, the composite silane film has high bonding force with polyester coating layers, the cross-cut test for the adhesion reaches the first grade, the comprehensive impact resistance reaches 50cm / kg, the bending resistance is less than 1mm, and the salt spray test is more than or equal to 500 hours.

Description

technical field [0001] The invention relates to metal surface treatment technology, in particular to a metal surface phosphating substitute treatment agent and a preparation method thereof. Background technique [0002] As people pay more and more attention to environmental protection, it has become a trend and development direction to replace traditional coating with environmentally friendly coating, and this development speed is getting faster and faster with the maturity of China's home appliance industry. In the past one or two years, the awareness of environmental protection of domestic home appliance enterprises has generally increased, and the acceptance of environmental protection coating pre-treatment process has been greatly improved. For a long time, some workpieces of home appliances have high requirements for anti-corrosion treatment. At present, the more common solution is to use a chemical and electrochemical reaction to form a phosphate chemical conversion co...

AI Technical Summary

Problems solved by technology

[0003] Although phosphating has excellent corrosion resistance and other properties, it also causes many problems, such as high energy consumption, serious pollution, harmful heavy metals, difficult wastewater treatment, and easy slagging on pipe walls and pipes.