Surface treatment liquid for zinc-aluminum-magnesium alloy steel plate as well as preparation method and use method of surface treatment liquid

Abstract

The invention belongs to the technical field of zinc-aluminum-magnesium alloy coated steel plates, and particularly relates to a zinc-aluminum-magnesium alloy coated steel plate surface treatment liquid and a preparation method and a use method thereof. The invention firstly provides a zinc-aluminum-magnesium alloy coated steel plate surface treatment liquid which comprises the following components in parts by weight based on 100 parts by weight of water: 5-20 parts by weight of silane coupling agent, 0.5-10 parts by weight of alkaline corrosion inhibitor, 1-10 parts by weight of zircon salt, 5-20 parts by weight of water-based lubricant, 15-35 parts by weight of water-based organic emulsion and 0.1-2.0 parts by weight of surfactant. The steel plate surface treatment liquid is suitable for a zinc-aluminum-magnesium steel plate with coating components of 0.5-6% of Al and 0.2-3.0% of Mg, an environment-friendly coating on the zinc-aluminum-magnesium surface can be compact and uniform, the coating is prevented from making contact with water vapor and oxygen in the environment, the corrosion resistance, blackening resistance, water resistance, fingerprint resistance, coatability and self-lubricating performance of the surface coating are remarkably improved, and the service life of the surface coating is prolonged. And the use requirements of stamping and coating of users are met.

Description

technical field [0001] The invention belongs to the technical field of zinc-aluminum-magnesium alloy coated steel sheets, and in particular relates to a surface treatment liquid for zinc-aluminum-magnesium alloy coated steel sheets and a preparation method and application method thereof. Background technique [0002] Zinc-aluminum-magnesium alloy coated steel sheet has very excellent corrosion resistance (corrosion resistance under paint film, flat corrosion resistance and cut protection), and also has good formability, weldability and coating performance, replacing hot-dip galvanized sheet , hot-dip galvanized panels, and hot-dip galvanized aluminum panels are becoming more and more obvious. [0003] The existing hot-dip galvanized aluminum-magnesium alloy coated steel sheets can be divided into "low aluminum" (WAl<5%), "medium aluminum" (5%≤WAl<13%) and "high aluminum" (47%≤WAl≤57% %) three types. With the increase of Al and Mg content, the corrosion resistance of ...

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Problems solved by technology

Silane coupling agents are generally hydrolyzed under certain conditions (acidic, alkaline or neutral), and the conditions are not specified in this patent document, which cannot guarantee the function of silane coupling agents and the stability of product quality

[0006] Blackening is a characteristic of zinc-aluminum-magnesium products, and there is no environmentally friendly surface coating with excellent blackening resistance

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