Ion palladium activating agent as well as preparation method and application thereof

Abstract

The invention provides an ion palladium activating agent as well as a preparation method and application thereof. The ion palladium activating agent is prepared from palladium tetramine sulfate, wherein in the ion palladium activating agent, the content of palladium tetramine sulfate is 10 to 50 ppm. Palladium tetramine sulfate used in the ion palladium activating agent provided by the invention is stably preserved in a solid form at the room temperature and is easy to store and transport; and moreover, palladium tetramine sulfate is high in stability in a neutral solution, the activating agent does not need to be adjusted to be strong acidic, so that the corrosion of an acidic solution for a product or device can be reduced.

Description

technical field [0001] The invention belongs to the technical field of surface treatment, and relates to an ionic palladium activator as well as its preparation method and application. Background technique [0002] The surface treatment technology of chemical nickel gold (ENIG) and chemical nickel palladium gold (ENEPIG) has good solderability, wettability, corrosion and wear resistance, oxidation resistance and other properties, and is applied to FPC, PCB, IC substrate and Wafer-level packaging and other fields. In these two surface treatment processes, it is necessary to undergo activation treatment on the designed copper circuit, and then use palladium as the nucleation center and active site to catalyze the subsequent nickel plating and palladium plating processes. Palladium activators are divided into colloidal palladium and ionic palladium. In actual production, ionic palladium is faster and more convenient to use than colloidal palladium. Currently, it is used on met...

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Problems solved by technology

[0003] CN104593751A discloses a kind of ultra-low concentration ionic palladium activation solution, which improves the precipitation ability of palladium by adding an accelerator in palladium sulfate, palladium chloride or dichlorotetraammine palladium, and the activation time is within 30s-3min. Due to Pd 2+ The stability itself is poor, and the addition of accelerators will directly affect the stability of the activation solution. At the same time, soluble palladium salts such as palladium sulfate, palladium chloride, or dichlorotetraammine palladium are unstable and need to exist in liquid form, which is not easy to store and transport. Moreover, Adding strong acid components such as sulfuric acid or hydrochloric acid to the activation solution has certain corrosiveness to products or equipment; By adding a small amount of ruthenium chloride to provide activity, the adjustment range of the solution temperature and acidity is greatly improved, but it contains a large amount of Cl - , Cl - The presence of the exposed circuit board in the environment is easy to form a primary battery and cause electrochemical corrosion. In the electronic packaging process, Cl - The existence of easily causes electric leakage; In CN104947090A, add complexing of ethylenediaminetetraacetic acid and surfactant sodium isooctyl sulfate in soluble palladium salt, through the formation of complexation and emulsification, reduce the permeation plating of activation and leak plating problem, but It is necessary to strictly control the activation time within 3 minutes. If the time is too short, it is easy to miss plating, and if the time is too long, it is easy to permeate. The controllability of activation is still limited.

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