Application of copper corrosion inhibitors in etching metal lead frames

Undercut is one of the key factors limiting the iterative upgrading of etched metal lead frames, and attenuating or eliminating the undercut is a common challenge faced by etch engineers, equipment manufacturers, and potion developers. Copper corrosion inhibitors as an anti-undercut additive were added to the acidic copper chloride etchant. Based on the principle of anti-undercut additive, the effective anti-undercut additive and its use of the concentration were screened out through the static and dynamic etching experiments. Finally, a kind of lead-frame product was used to verify the improvement effect of anti-undercut additive on the uniformity of etching size. It provides a feasible method for the improvement and enhancement of the etching process in the metal lead frame industry, and at the same time fills the research gap of anti-side-etching agents in the metal lead frame industry.