Baking varnish for magnesium aluminum alloy base material and preparation and using methods thereof

Abstract

The invention discloses a baking varnish for a magnesium aluminum alloy base material and preparation and using methods thereof. The preparation method comprises the following steps of: (1) adding polyester modified acrylic resin, epoxy resin, an anti-forming agent, a dispersing agent, a wetting agent, a leveling agent, and a part of solvent in a certain ratio into a stirring kettle sequentially and stirring; (2) adding color paste, filler, and an antisetting agent and stirring in a high speed; and (3) finally adding amino resin, adhesion promoter, and residual solvent and uniformly stirring to finish the whole preparation process of the polyester baking varnish. The using method of the prepared polyester baking varnish for the magnesium aluminum alloy base material comprises the following steps of: weighing the polyester baking varnish for the magnesium aluminum alloy base material, stirring uniformly in the weight ratio of the polyester baking varnish to diluents of 1:(0.4-0.6), spraying to the magnesium aluminum alloy base material, placing for 10 to 20 minutes, baking at the temperature of between 150 and 170 DEG C for 20 to 30 minutes, and baking and curing to obtain the polyester baking varnish layer.

Description

technical field [0001] The invention relates to a baking varnish, in particular to a baking varnish for a magnesium-aluminum alloy base material, a preparation method and a use method thereof. Background technique [0002] Magnesium alloy is currently the lightest metal engineering material, with a density of 1. 74 g / cm3, only 2 / 3 of aluminum and 1 / 4 of iron. At the same time, it has high strength, good electrical and thermal conductivity, and good damping and shock absorption With electromagnetic shielding performance, and low processing energy consumption, it can be recycled directly. Therefore, it has received widespread attention in industries such as automobiles, aerospace, and electronics, and is known as a green engineering material in the 21st century. However, due to the strong electrochemical activity of magnesium alloys, they are faced with serious corrosion problems when used in structural parts, such as galvanic corrosion of contact parts with dissimilar metal...

AI Technical Summary

Problems solved by technology

However, due to the strong electrochemical activity of magnesium alloys, they are faced with serious corrosion problems when used in structural parts, such as galvanic corrosion of contact parts with dissimilar metals, corrosion of the inner surface of lightweight engine parts by refrigerants, road antifreeze salts, etc. general corrosion

Among the many anti-corrosion measures for magnesium alloys (high-purity alloys, new alloys, ion implantation, rapid solidification process, surface protection layer, etc.), coating protection technology is low in cost and simple in process, but due to the chemical activity of magnesium alloy itself and casting defects, etc. Factors have brought great difficulties to the coating of traditional coatings, so in order to obtain coatings with high adhesion, strong corrosion resistance and beautiful appearance on the surface of magnesium alloys, it is necessary to go through the correct pretreatment process

Although good bonding force and corrosion resistance can be obtained after proper pretreatment, there are still problems such as non-conductivity of the film layer and environmental protection.

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