Galvanizing steel strip with good conductivity, high corrosion resistance and fingerprint resistance, surface treatment agent and treatment method

Abstract

Provided is a galvanizing steel strip with good conductivity, high corrosion resistance and fingerprint resistance, a surface treatment agent and a treatment method. The galvanizing steel strip is covered with a fingerprint-resistant film, wherein the film composition comprises: polyurethane and / or acrylic organic resin (A), with the weight percentage thereof being 40% to 60%; an organic silane coupling agent (Ba) containing one or more amino function groups which has at least one active hydrogen, and an organic silane coupling agent (Bb) containing at least one epoxy function group the number of which is more than one, with the weight ratio of Ba to Bb being from 0.3 to 0.5 and the weight percentage of the organic silane coupling agent being 38% to 53%; organo phosphorous compounds (C), with the weight percentage of phosphorus element being 0.01% to 0.1%; vanadium compounds (D), with the weight percentage of vanadium element being 0. 1% to 1.0%; titanium compounds or fluorine-containing titanium compounds (E), with the weight percentage of titanium element being 0. 1% to 3.0%; and polyethylene wax, with the weight percentage thereof being 1% to 3% of the film.

Description

technical field [0001] The invention relates to a galvanized steel strip and its surface treatment technology, in particular to a galvanized steel strip with good electrical conductivity, high corrosion resistance and fingerprint resistance, a surface treatment agent and a treatment method, which can meet the requirements that were difficult to achieve with the previous non-chromate coating technology. At the same time, it satisfies the characteristics of excellent electrical conductivity and high corrosion resistance, and has the moisture and heat resistance, heat resistance, fingerprint resistance, weldability, coating and processing blackening resistance of general non-chromate coatings. full performance. Background technique [0002] Galvanized steel strip is one of the most widely used metal products in the world, used in appliances, construction and automotive. In order to further improve the corrosion resistance of galvanized steel strips, many kinds of chromium-free...

AI Technical Summary

Problems solved by technology

Chinese Patent Publication No. CN101435078A discloses a chrome-free resin composition with good corrosion resistance, alkali resistance, processability, electrical conductivity and chemical resistance and a method for treating galvanized steel strip with this composition, Its composition is composed of polyurethane resin, organic oxides of Ti and Zr, inorganic salts and water-based solvents, but the galvanized steel strip treated with such a composition has corrosion resistance, electrical conductivity and other useful properties. However, the examples show that its conductivity is only below 1mΩ (surface resistance), and its corrosion resistance (based on neutral salt spray test) is 96 hours

Such performance is not enough for industries that require higher conductivity and corrosion resistance, such as copiers, fax machines and other office automation appliances.

[0003] U.S. Patent US 2005 / 0058843A1 provides a method for treating galvanized steel sheets with a water-based composition mixed with two silanes such as vinyl silane and amino silane. test meter), but the treatment method is to soak the steel plate in the above-mentioned aqueous composition and dry it for 5 minutes, which cannot realize the continuous treatment of galvanized steel strip

[0004] Chinese Patent Publication No. CN101228294A provides a non-chromate surface-treated metal material with corrosion resistance, heat resistance, fingerprint resistance, electrical conductivity, paintability and blackening resistance during processing. The surface is coated and dried with a water-based metal surface treatment agent to form a composite film containing various components. However, the conductivity provided by this patent only guarantees the interlayer resistance value, and does not involve the surface resistance value that the home appliance industry is particularly concerned about.

[0005] Chinese Patent Publication No. CN 101688309A provides a water-based surface treatment solution for galvanized steel sheets and galvanized steel sheets. By treating the GI and GA surfaces, the steel sheets can simultaneously obtain good electrical conductivity and high corrosion resistance, as well as coating and alkali resistance. However, because the technical route adopted is that inorganic salt is used as the film-forming skeleton of the coating, and only part of the organic acrylic resin is mixed in the coating, it is difficult to guarantee excellent anti-fingerprint performance with such a coating structure

[0006] Chinese Patent Publication No. CN 1887449A provides a surface treatment agent for galvanized steel sheets with excellent alkali resistance and solvent resistance, which is treated with an aqueous treatment agent composed of polyurethane, silane, specific inorganic salts and a small amount of additives. The galvanized steel sheet can obtain a chromium-free fingerprint-resistant steel strip with excellent alkali resistance, solvent resistance, corrosion resistance, fingerprint resistance, paintability, and processing blackening resistance, but this patent cannot guarantee that the coating has Under the film thickness conditions of the above properties, it has good surface conductivity at the same time

To sum up, the various chromium-free surface treatment technologies currently available are difficult to combine good electrical conductivity, high corrosion resistance, fingerprint resistance and other comprehensive properties to meet the needs of high-end home appliance users. Chrome-free fingerprint-resistant galvanized steel strip

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