Precautions for Liquid Silicone Overmolding: Adhesion of Nickel-Plated Parts

Key Considerations for Liquid Silicone Encapsulation of Nickel-Plated Parts: Adhesion

The biggest challenge in liquid silicone encapsulation of nickel-plated parts is ensuring reliable adhesion while preventing silicone curing inhibition. Special attention must be paid to material selection, surface treatment, and process control.

Core Principle 1: Surface Treatment of the Nickel-Plated Layer is Fundamental

The surface of the nickel-plated layer is dense and smooth, making it difficult for liquid silicone to adhere directly. Treatment is needed to activate the surface:

Thorough Cleaning: Use alcohol or specialized solvents to completely remove oil, fingerprints, and dust from the nickel-plated part surface. Even microscopic contaminants can cause adhesion failure.

Surface Roughening: Use sandblasting (surface roughness Ra 1.6-3.2 micrometers) or chemical etching to provide micro-anchor points for the silicone, creating mechanical interlocking.