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Use of Polyacrylic Acid Macromolecules to Improve Stiffness and Adhesive Bond Durability of Zinc Phosphate Conversion Precoatings

机译:聚丙烯酸大分子用于改善磷酸锌转化预涂层的刚度和粘合剂粘结性的用途

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The electrostatic internal diffusion and segmental chemisorption of polyelectrolyte macromolecules, either on newly precipitated crystal nuclei or on crystal growth sites during primary zinc phosphate (Zn.Ph) conversion processes applied to cold-rolled steel surfaces, contribute significantly to the controllability of the Zn.Ph crystal dimensions. This results in an improvement in the stiffness and ductility of the normally brittle Zn.Ph layers. The polymer-polymer chemical bonding, produced at the polymer topcoat-to-polyelectrolyte-Zn.Ph precoat interfacial joints, plays a key role in achieving a long-term bond durability of the metal-adhesive joints upon exposure to chemically corrosive environments. (ERA citation 11:016563)

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