ProHere®

Superior Binding & Adhesion For Metal Topcoats

Joining metal components for extended use under demanding conditions requires durable and reliable metal fasteners. Electroplating—the process of coating a metal with a thin layer of another metal via electrolysis—is frequently used to improve the corrosion resistance of metal fasteners. Electroplating also improves the tensile strength and hardiness of the metal substrate.

Electroplating is typically a two-step process which includes galvanizing the substrate with a layer of zinc and adding a trivalent chromate layer during passivation. After the substrate is plated, a topcoat is applied to provide additional protection.

Michelman’s ProHere® E water-based dispersions improve the binding properties of the topcoat formulation and promote adhesion of the topcoat to the metal substrate.

ProHere® E enhances binding & adhesion in the topcoat. Topcoat or sealant layer (0.5-4µm thick) Trivalent chromate passivate layer (0.06-0.1µm thick) Zinc alloy layer (8-14µm thick) Substrate Anatomy of a Zinc Alloy Coating