Environmental-protection tin stripping liquid

Abstract

The invention discloses environmental-protection tin stripping liquid. The environmental-protection tin stripping liquid comprises the following components in percentage by weight: 5-50% of sulfuric acid, 1-20% of oxidizing agent, 1-20% of complexing agent, 1-20% of accelerating agent, 1-10% of surface active agent, and the balance of water. The environmental-protection tin stripping liquid can replace nitric acid for deplating and cleaning of electrotinning and chemical tin plating, reduces emission of nitrogen-contained waste water and emission of nitrogen monoxide and nitrogen dioxide poison gas due to use of nitric acid, and prevents potential safety hazards caused by use of nitric acid.

Description

Technical field [0001] The invention relates to an environmentally-friendly tin stripping liquid, which is used to replace nitric acid for cleaning and deplating tin electroplating and chemical tin plating, and belongs to the field of metal deplating. Background technique [0002] Since the patent of tin electroplating was issued in 1843, tin plating technology has been continuously improved with the development of science and technology for more than 100 years. At first, it was mainly used as a protective coating for steel metal. However, with the rise of the third industrial revolution in the middle of the 20th century, the development of the electronic industry is advancing by leaps and bounds. Due to its excellent solderability, tin (and its alloy) coatings are gradually applied to semiconductor devices, connectors, resistors and capacitors and other electronic industries. As a welding coating. [0003] Nowadays, the industrialization of tin electroplating has been very mature...

AI Technical Summary

Problems solved by technology

During the use of nitric acid, it will volatilize to form acid mist and pollute the atmosphere; it will decompose to form nitrogen dioxide yellow smoke and nitric oxide mental poison; it will cause severe burns and scars when it touches the skin, which will pose hidden dangers to the personal safety of on-site opera

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