Study on Adhesion Promoter for Titanium Alloy Surface

ABSTRACT: Different adhesion promoters were prepared, and the adhesion of coatings on TITANIUM alloy was tested by pull-apart method, and the adhesion promotion of different adhesion was evaluated. The contribution of the agent to the adhesion of the coating on the titanium alloy was screened out. The adhesion promoter was prepared by modified polyamide modified coupling agent KH-560. By studying the influence of their different mass ratio on adhesion and storage stability (gel), and the influence of solvent dosage on the storage stability of the adhesion promoter, the final mass ratio of coupling agent and modified polyamide was determined. 4:1 and 60% of the solvent was added.

Key words: Titanium alloy; adhesion promoter; pull-apart adhesion

Titanium alloy is an alloy with a small amount of other elements added to Titanium element. Titanium, as an important structural metal, was developed in the 1950s. Titanium alloys have the characteristics of strong corrosion resistance, high strength, low density and stable performance at medium temperature. With the rapid development of titanium industry, its application fields are becoming more and more extensive. In the 1950s and 1960s, titanium alloys were used in the aviation field and are known as "AIR metal". In the 1970s, they are also known as "land metal".“ Marine Metals. At present, the excellent properties of titanium and titanium alloys have been recognized all over the world, and have been widely used in the field of anti-corrosion. This is because titanium alloys are more active, the surface is easy to form a dense oxide film, which can play a role in anti-corrosion. All materials have their advantages and disadvantages. In order to expand the application range of titanium alloys, the main way to achieve this goal is to improve the corrosion resistance, fretting wear resistance, wear resistance and high temperature oxidation resistance of titanium alloys. Titanium alloy surface treatment has been applied to almost all methods of metal surface treatment at present. The traditional coating technology is efficient and easy to operate, and has been widely used. Therefore, coating technology is an effective way to improve the oxidation property of titanium alloys. This is mainly because titanium alloys are easily oxidized to form oxide films in air. The oxide films are not only compact, but also have low surface energy. Low surface energy is not conducive to the adhesion of coatings. The establishment of adhesion between coatings and substrates mainly includes physical bonding (Van der Waals force) and chemical bonding. All right.

Because the surface energy of titanium alloy is low, the contact angle between coating material and substrate is small, and the wettability of coating on substrate is limited, so the adhesion of coating material is affected by physical way. To solve the problem of adhesion of coating material, only functional groups that can form chemical bonds with substrate can be introduced, and the surface energy of the interface with substrate can be improved. In this paper, by preparing and comparing the contribution of different adhesion promoters to adhesion, the optimum scheme is screened out, and the adhesion promoter which acts as a bridge between the surface of titanium alloy and the coating is prepared. It is not only conducive to the formation of chemical bonds between the coating and the substrate, but also conducive to improving the surface energy of the substrate, thus achieving the efficient adhesion of the coating to the titanium alloy. At the same time, the adhesion promoter has been further optimized to make its performance more stable and wider application.

1.Test part

1.1.Test raw materials and equipment

Test raw materials: gamma-aminopropyl triethoxysilane (KH-550), bis(3-triethoxysilyl propyl) amine (KH-270), gamma-glycidyl ether oxypropyl trimethoxysilane (KH-560): industrial grade, Hangzhou Jessica Chemical Co., Ltd., epoxy resin: industrial grade, triwood chemical industry; bisphenol F type epoxy resin Resin: Industrial grade, South Asia Chemical Industry; Rubber modified epoxy resin, active diluent: Industrial grade, Jiadida New Materials Co., Ltd; Polyamide resin: Industrial grade, air chemical industry; Anhydrous ethanol, methanol, Xylene and other solvents: Industrial grade, Tianjin Chemical Reagent Factory; Catalyst (37% hydrochloric acid): Analytical purity, Tianjin Chemical Reagent Factory; Deionized water: self-made.

Test equipment: High-speed disperser and AT-A coating adhesion drawing instrument for laboratory use.