Casing and manufacturing method thereof

Abstract

A casing comprises an aluminum / magnesium metal substrate, an anti-corrosion layer and a colored layer, wherein the anti-corrosion layer is formed on the surface of the aluminum / magnesium metal substrate and comprises an aluminum copper film and an aluminum nitride gradient film which are sequentially formed on the surface of the aluminum / magnesium metal substrate, and the percentage composition of the N atoms in the aluminum nitride is increased in a gradient manner from near to far from the aluminum / magnesium metal substrate. The casing has excellent corrosion resistance and decorative appearance. The invention further provides a manufacturing method of the casing, which includes the following steps of providing the aluminum / magnesium metal substrate, sputtering an anti-corrosion layer on the aluminum / magnesium metal substrate and a decorative color layer on the anti-corrosion layer in a magnetic control manner, wherein the anti-corrosion layer comprises the aluminum copper film and the aluminum nitride gradient film which are sequentially formed on the surface of the aluminum / magnesium metal substrate.

Description

technical field [0001] The invention relates to a casing and a manufacturing method thereof. Background technique [0002] Vacuum coating technology (PVD) is a very environmentally friendly film-forming technology. The film layer formed by vacuum coating has the advantages of high hardness, high wear resistance, chemical stability, firm combination with the substrate, and bright metal appearance. Therefore, vacuum coating is applied on the surface of metal substrates such as aluminum, aluminum alloy, and stainless steel. Applications in the field of decorative treatments are increasing. [0003] However, since the standard electrode potential of aluminum, aluminum alloy, magnesium or magnesium alloy is very low, the potential difference with the PVD coating, such as TiN layer, TiN layer or CrN layer is relatively large, and the PVD coating itself will inevitably have tiny pores. , such as pinholes and cracks, make the aluminum, aluminum alloy, magnesium or magnesium alloy ...

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Problems solved by technology

[0003] However, since the standard electrode potential of aluminum, aluminum alloy, magnesium or magnesium alloy is very low, the potential difference with the PVD coating, such as TiN layer, TiN layer or CrN layer is relatively large, and the PVD coating itself will inevitably have tiny pores. , such as pinholes, cracks, resulting in aluminum, aluminum alloy, magnesium or magnesium alloy substrates prone to micro-battery corrosion

Therefore, directly coating the TiN layer, TiN layer or CrN layer on the surface of the aluminum, aluminum alloy, magnesium or magnesium alloy substrate cannot effectively improve the corrosion resistance of the aluminum, aluminum alloy, magnesium or magnesium alloy substrate. The PVD coating itself will also have discoloration and peeling off, making it difficult to maintain a good decorative appearance

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