Zinc removing solution for magnesium-lithium alloy after zinc immersion

Abstract

The invention discloses a zinc removing solution for a magnesium-lithium alloy after zinc immersion. The zinc removing solution for the magnesium-lithium alloy after zinc immersion is an aqueous solution which is prepared from the following components: 30 to 60 g / L of ammonium bifluoride, 30 to 90 ml / L of 85 weight percent phosphoric acid and 30 to 120 ml / L of glycerol. At room temperature, a magnesium-lithium alloy workpiece which is subjected to the zinc immersion is placed in the zinc removing solution, and part of a zinc layer on the surface of the magnesium-lithium alloy can be removed effectively after the zinc removing time of 30 to 50 seconds; and the zinc layer which is uniform in coverage, fine in particles and good in bonding force can be obtained by secondary zinc immersion, sothat the quality of the zinc layer can be effectively improved. The zinc removing solution for the magnesium-lithium alloy after zinc immersion is reasonable in composition, stable in component and easy to control, and can reduce the corrosion of the magnesium-lithium alloy workpiece.

Description

technical field [0001] The invention belongs to the technical field of magnesium-lithium alloy surface treatment, in particular to a zinc-removing solution for magnesium-lithium alloy after zinc immersion. Background technique [0002] Magnesium-lithium alloy is currently the lightest alloy, and it is also one of the most promising ultra-light and high-strength alloy systems. Compared with other magnesium alloys, magnesium-lithium alloy has many advantages, such as specific strength and specific stiffness. Under the same conditions, the corrosion potential and corrosion current of magnesium-lithium alloys are lower than those of ordinary magnesium alloys. Therefore, when the surface treatment of magnesium-lithium alloy is used, the complexity and difficulty of handling are far more than that of other ordinary magnesium alloys. [0003] Electroless nickel plating on the surface of magnesium-lithium alloy has many advantages such as uniform coating, good electrical conductivi...

AI Technical Summary

Problems solved by technology

However, due to the thin zinc-dipping layer, the magnesium-lithium alloy substrate is easily over-corroded when the above-mentioned stripping solution is used to strip zinc, which will not only affect the performance of the magnesium-lithium alloy substrate itself, but also affect the quality after zinc dipping, resulting in subsequent electroless plating. Nickel-phosphorus alloy layer bonding is poor