Effect of Surface Structure on Interfacial Bonding Strength of Metal⁃Plastic Composite Injection⁃Molded Parts

doi:10.19491/j.issn.1001-9278.2020.04.009

Abstract

Abstract:

In this study, micro?scale pores were obtained on the metal surface by a simple chemical cleaning and etching method, and then a polymer was bonded with the resultant metal through composite injection molding. The surface microstructure was achieved at different scales by changing the dipping time of aluminum sheets in solution, and the influence of surface microstructure on the interface bonding strength was investigated. The results indicated that there were dense micro?sized pores on the surface of aluminum sheets after treated with hydrochloric acid. With an increase of corrosion time, the pore diameter and pore density of the metal surface increased at first and then tended to decrease. The interfacial bonding strength was found to increase at first and then decrease as a result of the combining effect of pore size and pore density, and it reached a maximum value of 10.24 MPa. This surface treatment method provides a theoretical foundation for engineering applications in the fields of automotive interiors, architectural decoration and electronic product enclosures.

Key words: surface treatment, microporous, composite injection molding

CLC Number:

TQ 320.66

Junxiang CHEN, Nanhong FU, Ruixue WANG, Kaifang DANG, Weimin YANG, Pengcheng XIE. Effect of Surface Structure on Interfacial Bonding Strength of Metal⁃Plastic Composite Injection⁃Molded Parts[J]. China Plastics, 2020, 34(4): 49-53.

Figures/Tables 10

Fig.1. Process flow chart

模具

温度/℃

注射

温度/℃

注射压力/

MPa

注射速度/

cm³·s^-1

保压压力/

MPa

Tab. 1. Injection molding parameters

Fig.2. Schematic diagram of polymer?metal structure

Fig.3. Tensile test instrument

Fig.4. Results of shear strength test

Fig.5. Metal and polymer bonding surface morphology after tensile testing

Fig.6. Electron micrograph of sodium hydroxide solution treatment

Fig. 7. Scanning electron micrograph of the surface of sodium hydroxide and aluminum hydroxide

Fig.8. Micropore area and quantity curve

Fig.9. Physical bolting diagram

1	LUCCHETTA G, MARINELLO F, BARIANI P F. Aluminum Sheet Surface Roughness Correlation with Adhesion in Polymer Metal Hybrid Overmolding[J]. CIRP Annals ⁃ Manufacturing Technology, 2011, 60(1):559⁃562.
2	TAKI K, NAKAMURA S, TAKAYAMA T, et al. Direct Joining of a Laser⁃ablated Metal Surface and Polymers by Precise Injection Molding[J]. Microsystem Technologies, 2016, 22(1):31⁃38.
3	KADOYA S, KIMURA F, KAJIHARA Y. PBT–anodized Aluminum Alloy Direct Joining: Characteristic Injection Speed Dependence of Injected Polymer Replicated into Nanostructures[J]. Polymer Testing, 2019, 75:127⁃132.
4	SHOTARO K, FUMINOBU K, YUSUKE K. Tester for Tensile Shear Evaluation of Metal–polymer Single Lap Joints[J]. Precision Engineering, 2018,54:321⁃326.

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