Anti-corrosion processing method for magnesium alloy surface and magnesium products thereof
A technology of anti-corrosion treatment and magnesium alloy, which is applied in the direction of metal material coating process, ion implantation plating, superimposed layer plating, etc., can solve the problems of easy pitting corrosion, large environmental pollution, shortened service life, etc., and achieve good Anti-corrosion performance, high chemical stability, good anti-corrosion effect
Inactive Publication Date: 2012-07-11
GUANGZHOU KAIYAO ASSET MANAGEMENT CO LTD
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Problems solved by technology
However, due to the high chemical activity of magnesium alloys, it is easy to oxidize in the air, forming a loose and poorly protective oxide film, which leads to severe corrosion of magnesium alloys in humid atmosphere, soil and seawater, which leads to the use of magnesium alloys. The service life of the products is shortened, which hinders the wide application of magnesium alloys
[0003] In order to improve the corrosion resistance of magnesium alloys, it is usually necessary to carry out surface film-forming treatment on the surface of magnesium alloys. The common treatment methods include anodic oxidation treatment, baking paint, etc., but these processes have great environmental pollution problems.
Although the vacuum coating (PVD) technology is a very environmentally friendly coating process, and can be coated with a variety of film layers and excellent wear resistance, when the surface of the substrate to be plated has microscopic depressions or voids, the film deposited by the PVD process The layer usually has a profiling structure on the surface of the substrate, and the film layer deposited in these depressions or voids is often thinner in other areas, so during use, the depressions or void areas tend to be more prone to pitting, making the film layer It cannot effectively prevent the magnesium alloy substrate from being corroded
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[0031] The preferred embodiment of the present invention magnesium alloy surface anti-corrosion treatment method mainly includes the following steps:
[0032] see figure 1 , providing a magnesium alloy substrate 20 .
[0033] The magnesium alloy substrate 20 is chemically degreased. Chemical degreasing involves immersing the magnesium alloy substrate 20 in a degreasing solution at 60-80°C for 30-60s. The degreasing solution used contains 25-30g / L sodium carbonate, 20-25g / L trisodium phosphate (Na 3 PO 4 12H 2 O) and the aqueous solution of 1-3g / L emulsifier, wherein said emulsifier can be OP-10 emulsifier, and its main component is the condensation product of alkylphenol and oxirane.
[0034] Activation treatment is performed on the magnesium alloy substrate 20 . The activation treatment step is to immerse the magnesium alloy substrate 20 in an HF aqueous solution containing 1%-3% by mass percentage for 3-5s, so as to remove the magnesium alloy substrate 20 formed on the ...
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Abstract
The invention provides an anti-corrosion processing method for a magnesium alloy surface and includes steps of providing a magnesium alloy substrate; subjecting the magnesium alloy substrate to alkaline degreasing; processing the magnesium alloy substrate with inorganic chemical conversion so that an inorganic chemical conversion coating is formed on the magnesium alloy substrate; processing the magnesium alloy substrate with organic chemical conversion so that an organic chemical conversion coating is formed on the inorganic chemical conversion coating; and forming a ceramic coating composed of refractory compounds on the organic chemical conversion coating by means of vacuum coating. The invention further provides magnesium products prepared through the anti-corrosion processing method.
Description
technical field [0001] The invention relates to a magnesium alloy surface anticorrosion treatment method and magnesium products thereof. Background technique [0002] Magnesium alloys have the advantages of light weight and good heat dissipation, and are widely used in communications, electronics, transportation, construction, aerospace and other fields. However, due to the high chemical activity of magnesium alloys, it is easy to oxidize in the air, forming a loose and poorly protective oxide film, which leads to severe corrosion of magnesium alloys in humid atmosphere, soil and seawater, which leads to the use of magnesium alloys. The service life of the products is shortened, which hinders the wide application of magnesium alloys. [0003] In order to improve the corrosion resistance of magnesium alloys, it is usually necessary to carry out surface film-forming treatment on the surface of magnesium alloys. The common treatment methods include anodic oxidation treatment, ...
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IPC IPC(8): C23C28/00C23C22/57C23C14/06
CPCC23C22/73C23C14/34C23C28/00C23C22/10C23C14/0676C23C22/83C23C22/57C23C14/0664
Inventor 张新倍陈文荣蒋焕梧陈正士毛盾
Owner GUANGZHOU KAIYAO ASSET MANAGEMENT CO LTD
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