Acid zinc dipping solution of magnesium-lithium alloy and zinc dipping method
A technology of magnesium-lithium alloy and zinc chloride solution, which is applied in the field of galvanizing of cast magnesium-lithium alloy, acidic zinc immersion solution of casting magnesium-lithium alloy electroplating and pretreatment before electroless plating, and surface treatment liquid of alloy materials, which can solve the problem of Can not meet the precision requirements of parts size, magnesium-lithium alloy substrate corrosion and other problems, to achieve the effect of low preparation cost, slow down strong corrosion and improve performance
Inactive Publication Date: 2010-09-15
HARBIN ENG UNIV
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Problems solved by technology
Since the magnesium-lithium alloy matrix is severely corroded by the alkaline zinc-immersion solution, it cannot meet the precise requirements on the size of the parts, so the alkaline zinc-immersion process has become increasingly unsuitable for magnesium-lithium alloys
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[0043] The following examples describe the present invention in more detail:
[0044] This embodiment is a new method for casting magnesium-lithium alloys with L-malic acid-containing acidic zinc immersion solution, which is easy to operate, mild in conditions, energy-saving, less toxic and low in cost.
[0045] A) The magnesium-lithium alloy sample is polished, and then etched with chromic anhydride, ferric nitrate, and potassium fluoride as the main components, the temperature is room temperature, and the time is 1.5 min;
[0046] B) Clean the sample etched by A) with cold water, and then with running water;
[0047] C) put the sample after B) into phosphoric acid and ammonium bifluoride solution for activation, the temperature is room temperature, and the time is 1.5min;
[0048] D) cleaning the sample after C) activation with flowing water;
[0049] E) Put the sample after D) into the acidic zinc dipping solution for zinc dipping treatment.
[0050] The preparation method...
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The invention provides acid zinc dipping solution and a zinc dipping method of magnesium-lithium alloy. The acid zinc dipping solution of the magnesium-lithium alloy is prepared by taking zinc chloride as main salt, malic acid as main coordination agent and acidity regulator, lactic acid as auxiliary coordination agent, sodium fluoride as additive and ammonia water as PH regulator. A thin, flat and smooth acid zinc dipping layer can be obtained by adopting the acid zinc dipping solution of the magnesium-lithium alloy of the invention to carry out zinc dipping for once, and the zinc particles of the acid zinc dipping layer are spherical, have uniform size and are tiny and compact, and the coverage degree of the zinc dipping layer on a basal body is rather high. After the acid zinc dipping, the plating layer obtained by either electroplating or chemical plating has excellent performance. The method has the advantages of low preparation cost, less preparation steps, simple operation, wild reaction conditions, capability of alleviating strong corrosion of strong basic zinc dipping solution to the basal body of the magnesium-lithium alloy, environment friendliness, energy saving, less conditions which need to be controlled and can be easily realized and great possibility of being applied to mass production.
Description
technical field [0001] The invention relates to a surface treatment liquid for alloy materials. Specifically, it is an acidic zinc dipping solution for casting magnesium-lithium alloy electroplating and pretreatment before electroless plating. The invention also relates to a zinc dipping method for casting magnesium-lithium alloy. It belongs to the field of inorganic metal materials. Background technique [0002] Magnesium-lithium alloy is the lightest metal structure material at present. It has the characteristics of ultra-light and high strength, and has excellent electromagnetic shielding ability, shock resistance, good toughness, high bending strength, and easy deformation processing. A preferred class of structural materials in the fields of electronics, military, etc. At present, the research on magnesium-lithium alloys at home and abroad mainly focuses on the preparation and properties of high-performance alloys. The research direction mainly focuses on melting an...
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Login to View More IPC IPC(8): C23C18/31C23C18/18
Inventor 黄晓梅张家军刘望
Owner HARBIN ENG UNIV