Laser cladding process for abrasion-resistant anticorrosion coating of water turbine unit runner

Abstract

The invention discloses a laser cladding method for an abrasion-resistant anticorrosion coating of a water turbine unit runner. The method is characterized by comprising the following steps of: performing surface cleaning on greasy dirt and rust layers on the surface of the water turbine unit runner; then selecting iron-based alloy powder, making the alloy powder discharged from an automatic powder feeding head fall into a laser molten pool by adopting laser equipment and an adjustable automatic powder feeding device, adjusting the powder feeding amount, and forming uniform and dense laser claddings on the processing surfaces of the upper and lower coronal planes, wherein the thicknesses of the laser claddings reach 0.2 to 1.8 millimeters; and finally, checking the processing parts of the upper and lower coronal planes of the runner by using a dye penetrant inspection method, wherein the processing parts are required without defects of cracks, air holes and the like. The laser cladding coating is uniform and dense, forms firm metallurgical bonding together with a matrix, has good abrasion resistance and anticorrosion performance, and can remarkably improve the abrasion-resistant and anticorrosion performance of the water turbine unit runner and prolong the service life of the water turbine unit runner.

Description

technical field [0001] The invention relates to a wear-resistant and anti-corrosion method for power generation equipment components, in particular to a process for preparing a wear-resistant and anti-corrosion alloy coating on the runner surface of a water turbine unit using laser cladding technology, which belongs to the IPC International Patent Classification C23C24 / 10 (2006.01) I technical field. Background technique [0002] The runner of the hydraulic turbine is a key component in the equipment of the hydraulic turbine. The wear and tear of the flow parts of the turbine has always been an intractable disease in the operation of hydropower stations. Especially with the intensification of environmental damage and the increase of sediment content, the wear and tear of turbine runners tends to intensify. Due to this wear and tear, the shape and surface of the flow-passing parts of the turbine have changed, thereby destroying the flow conditions that the water flow should...

AI Technical Summary

Problems solved by technology

However, for other specific equipment components, such as special structures such as turbine runners, the existing laser cladding process is obviously unable to adapt

[0013] According to the applicant's search and verification: there is no domestic precedent for the use of laser cladding technology to complete the wear-resistant and anti-corrosion alloy coating on the runner surface of the water turbine unit, and there are no related reports abroad.