Preparation method of functionally graded nanometer multilayer coating on steel workpiece surface and product comprising said functionally graded nanometer multilayer coating

Abstract

The invention relates to a preparation method of a functional gradient multi-layer nano coating on the surface of a steel workpiece and a product comprising the functional gradient multi-layer nano coating, particularly discloses a method for depositing the functional gradient multi-layer nano coating on the surface of the steel workpiece and the functional gradient multi-layer nano coating deposited on the surface of the steel workpiece and further relates to the product. The product comprises the steel workpiece and the functional gradient multi-layer nano coating which is deposited on the surface of the steel workpiece and covers at least part of the surface of the steel workpiece. The functional gradient multi-layer nano coating comprises a Cr base layer deposited on the surface of the steel workpiece, a CrN transition layer deposited on the Cr base layer, a (Cr and Si)N gradient layer deposited on the CrN transition layer, and a (Cr, Al and Si)N surface layer deposited on the (Cr and Si)N gradient layer. The functional gradient multi-layer nano coating is mainly in a silver gray color and an imitating stainless steel color, the overall thickness of the functional gradient multi-layer nano coating is 3-5 micrometers, and the surface hardness value of the functional gradient multi-layer nano coating reaches 2000-3000 HV. The functional gradient multi-layer nano coating is high in glossiness, bonding strength and surface hardness and excellent in abrasion resistance and corrosion resistance.

Description

technical field [0001] The invention relates to a method for depositing a functional gradient nanometer multilayer coating on the surface of a steel workpiece and the functional gradient nanometer multilayer coating deposited on the surface of the steel workpiece. The invention also relates to an article comprising said steel workpiece and said functionally graded nano-multilayer coating deposited on the surface of said steel workpiece and covering at least a part of said steel workpiece surface. Background technique [0002] The traditional method of forming a wear-resistant, corrosion-resistant and anti-oxidation coating on the surface of steel workpieces, especially stainless steel workpieces, is to electroplate hard chromium on the surface, but the hexavalent chromium produced during electroplating will seriously pollute the environment, so it is gradually vacuum ion plating ( IonPlating) nitride coating instead. CrN (chromium nitride) coating has the advantages of high...

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Problems solved by technology

However, the existing (Cr,Al,Si)N thin film preparation process still adopts a single ion coating process, which is bound to cause large particle pollution on the surface of the cathodic arc ion plating, which makes the surface roughness of the film higher and magnetron sputtering ion plating. The low ionization rate leads to technical defects such as insufficient film structure

Although, there have been researches to prepare (Cr,Al,Si)N thin films by ion plating composite process, for example, Young Su Hong et al. (Young Su Hong et al., Effects of Cr interlayer on mechanical and tribological properties of Cr-Al-Si- N nanocomposite coating[J]Transactions ofNonferrous Metals Society of China,2011,21:62-67) adopts arc ion plating(AIP)combined with a DC reactive magnetronsputtering, Due to the use of mutually independent Cr, Al and Si targets, it is more difficult to control the stoichiometric ratio of Si doping elements; Min Su Kang et al. (Min Su Kang et al., Synthesis and properties of Cr-Al-Si-Nfilms deposited by hybrid coating system with high power impulse magnetronsputtering (HIPIMS) and DC pulse sputtering [J] Transactions of Nonferrous Metals Society of China, 2012, 22:729-734) using a hybrid process of high power pulse magnetron sputtering and DC pulse sputtering ( high power impulse magnetron sputtering (HIPIMS) and DC pulse sputtering), but the above-mentioned new process not only requires high equipment investment, but also the process control is extremely difficult, which largely limits its popularization and application in the same industry in China

[0007] Cathodic arc ion plating CrN film (3 ~ 5μm) has a surface hardness of about HV1000 ~ 1500, which has good wear resistance and scratch resistance. However, for watch appearance parts, its inherent large particles will inevitably affect the coating. Surface finish and decorative color (the appearance of CrN coating is darker, so its visual effect is not good)

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