Soldering flux for lead-tin soldering of shaft tips of instrument

Abstract

The invention relates to a soldering flux for lead-tin soldering of shaft tips of an instrument, and aims to solve the problem that the conventional shaft tips (anti-seismic abrasion-resistant alloy tool steel) of the instrument cannot be subjected to the lead-tin soldering. The soldering flux consists of rosin, phosphoric acid and alcohol, wherein moderately strong phosphoric acid is used as an antioxidant; the rosin is acidic at a high temperature so as to enhance the effect of an anti-oxidation film; meanwhile, the rosin can reduce surface tension and increase soldering fluidity, is favorable for soldering and wetting weldments, has anti-oxidation effect and floats on the surface of the soldering flux after being molten to form an isolating layer, so that the solder side is prevented from being oxidized; and the alcohol can enhance the fluidity of the soldering flux, make the soldering flux uniformly coated, dissolve a lubricant for cleaning the solder side, and enhance the humidity of the soldering flux so as to fulfill the aim of the lead-tin soldering. The soldering flux can be used for the lead-tin soldering of the shaft tips of the instrument, and can also be used for the lead-tin soldering of other metals such as stainless steel and the like; meanwhile, the soldering flux has the advantages of convenient preparation, low cost and easy popularization.

Description

Technical field [0001] The present invention is a flux. Background technique [0002] At present, fluxes used for metal tin-lead soldering in instrument manufacturing include rosin, solder paste, etc., which can play a role in soldering copper, iron and other metals. However, because the instrument shaft tip is generally made of anti-seismic and wear-resistant alloy tool steel materials such as U115W-UN1 2955 or 3J22, the existing various fluxes cannot achieve tin-lead soldering of the instrument shaft tip. Contents of the invention [0003] The object of the present invention is to provide a flux for tin-lead soldering of instrument shaft tip, so as to realize the tin-lead soldering of instrument shaft tip. [0004] The present invention realizes the purpose of the invention in this way: dissolve rosin with alcohol, add phosphoric acid to form liquid flux, use medium-strong phosphoric acid as deoxidant, rosin is acidic at high temperature and strengthens the effect of re...

AI Technical Summary

Problems solved by technology

However, since the shaft tip of the instrument is generally made of anti-seismic and wear-resistant alloy tool steel such as U115W-UN1 2955 or 3J22, the existing various fluxes cannot achieve tin-lead soldering of the shaft tip of the instrument.