Composite Strengthening Method for Large-area Flat Coatings

Abstract

The invention discloses a large-area flat coating composite strengthening method, which belongs to the field of metal material surface processing. The composite strengthening method includes: S1. using an ultrasonic vibration-assisted circumferential milling process to form regularly distributed micron / nano-level furrow-shaped three-dimensional microstructures on the workpiece surface; S2. surface coating; S3. using an ultrasonic rolling process to The coated surface is mechanically strengthened. Compared with the prior art, the large-area flat coating composite strengthening method of the present invention can greatly improve the bonding strength of the bonding interface between the base material and the coating layer, and at the same time improve the hardness, fatigue strength and wear resistance and corrosion resistance of the final formed surface. It is a comprehensive and effective surface treatment method for planar high-strength engineering components, and has good popularization and application value.

Description

technical field [0001] The invention relates to the field of surface processing of metal materials, and specifically provides a composite strengthening method for a large-area plane coating. Background technique [0002] In order to improve the tribological properties of the workpiece, improve its anti-corrosion performance, or improve its construction process, surface treatment of metal workpieces has become a routine treatment method, and surface coating is one of the most common methods. The commonly used coating method Such as electroplating, chemical plating, laser cladding, ion-assisted coating, cold spraying, thermal spraying, chemical vapor spraying, physical vapor spraying, physical vapor deposition, etc. [0003] The electroless plating technology is a plating method that reduces the metal ions in the plating solution to metal and deposits them on the surface of the part with the help of a suitable reducing agent without an external current. Compared with electrop...

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Problems solved by technology

However, both electroless plating technology and physical vapor deposition technology have the following disadvantages: first, the film / substrate bonding force is weak, and the film layer is prone to fall off, resulting in component failure; second, the surface roughness after coating is high, and there are Residual tensile stress, resulting in poor mechanical properties of components and short service life

However, the above method is to strengthen the final forming surface after the coating process by using plastic strengthening processes such as ultrasonic rolling to improve surface roughness and residual stress distribution. However, there is still the problem of insufficient coating film / base bonding force. However, the post-strengthening treatment under the condition of insufficient film / substrate bonding force is often prone to the problem of film layer sliding or microscopic cracks.

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