Nanometer barite powder-terpene resin composite waterborne Dacromet coating solution and preparation method thereof

Abstract

The invention discloses a nanometer barite powder-terpene resin composite waterborne Dacromet coating solution. The nanometer barite powder-terpene resin composite waterborne Dacromet coating solution is prepared from, by weight, 20-30 parts of aluminum and zinc powder, 1-2 parts of nanometer barite powder, 1-2 parts of terpene resin emulsion, 3-5 parts of hydroxyethyl cellulose, 0.1-0.2 part of octenyl succinic anhydride, 0.3-0.5 part of petroleum sodium sulfonate, 0.3-0.5 part of butyl titanate, 0.3-0.5 part of a titanate coupling agent TMC-201, 0.5-1 part of citric acid, 1-2 parts of cerium nitrate, 0.5-1 part of ethylenediamine tetramethylene phosphonic acid, 6-8 parts of absolute ethyl alcohol, 2-4 parts of triethanolamine and 40-60 parts of water. The Dacromet coating solution can form a coating high in strength, good in wear resistance and excellent in corrosion resistance on the surface of a matrix and achieve a good protective effect; besides, the Dacromet coating solution is high in adhesion, good in ageing resistance and heat stability and long in service life and has high practical value.

Description

technical field [0001] The invention relates to the field of metal surface anticorrosion coatings, in particular to a nano-barite powder-terpene resin composite water-based dacromet coating solution and a preparation method thereof. Background technique [0002] Dacromet technology is a new type of surface treatment technology. The workpiece is directly immersed in the treatment solution containing zinc powder, aluminum powder and chromic anhydride as the main raw materials, or brushed or sprayed to make the treatment solution adhere to the surface of the workpiece, and then Sintering forms an inorganic conversion film containing zinc, aluminum, and chromium to protect the surface of the workpiece. Compared with the traditional electroplating process, Dacromet coating has superior corrosion resistance and stability, and does not pollute the environment during processing. Because auto parts have high requirements for stability, heat resistance, moisture resistance and corros...

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Problems solved by technology

[0003] However, Dacromet coating is not a complete "green coating", and there will be a small amount of Cr remaining in Dacromet coating. 6+ , have a great poisonous effect on people, animals and plants, and cause certain pollution to the ecological environment

However, the corrosion resistance of the coating formed by the chromium-free Dacromet coating solution is greatly reduced, and it is difficult to meet the application requirements.

Moreover, the poor mechanical properties of dacromet coating, low bonding force with the substrate, and low storage stability limit its application range.