Abstract
The interlayer adhesion strength between nickel‐aluminum bronze (NAB) and epoxy coating and the corrosion resistance of the coating were investigated. The surface state of NAB with sandpaper abrasion, machining, and sandblasting is observed through laser confocal microscope. The pull‐off test measures the interlayer adhesion strength between the primer and the intermediate coating of different proportions. Electrochemical impedance spectroscopy (EIS) evaluate the corrosion resistance of the single‐layer primer and the matching intermediate coating. Chemical bond composition and content of the composite coating at different positions are evaluated by X‐ray photoelectron spectroscopy (XPS). The results show that the interlayer adhesion strength between the substrate abraded by 40 mesh sandpaper and primer is the largest (18.1 MPa). When the ratio of bisphenol A epoxy resin to phenolic amine of primer is (2.40:0.70) and the ratio of bisphenol A epoxy resin to polyamide of intermediate coating is (3.00:0.34), the multiple interlayer adhesion strength is the largest (20.51 MPa). The atomic content of N–C=O (288.4 eV) in primer/intermediate coating interface is the highest amount of them, up to 1.91%. Compared with a single‐layer epoxy coating (|Z|0.01 Hz = 1.30 × 108 Ω cm2), using matching coatings (|Z|0.01 Hz=2.06 × 1011 Ω cm2) can improve the corrosion resistance of the coating.
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