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Surface pretreatment techniques for thermal spray technology

Author: langfeng Time: 2018-01-02

Changsha Langfeng Metallic Material Co.,Ltd.

Surface pretreatment techniques for thermal spray technology

Thermal spray surface preparation is generally divided into surface preparation, surface cleaning and surface roughening (or activation) in three steps.
1 surface pre-processing
Its purpose: First, the workpiece surface suitable for coating deposition, increase the bonding area; the second is to overcome the shrinkage of the coating stress. Some parts of the workpiece corresponding pre-processing to disperse the local stress coating to increase the shear resistance of the coating. Common methods are cutting corners and pre-coated troughs. The rough surface of the workpiece thread is also one of the commonly used methods, especially in the spraying of large parts commonly used thread turning to increase the combined area. Turning thread should pay attention to two problems, first of all, the thread cross-section should be suitable for spraying, rectangular cross-section or semicircular cross-section is not conducive to the combination of coating. In addition, the thread should not be too deep, otherwise the coating is too thick, the cost increases. It is also possible to "knurl" the coated surface or to combine the thread turning and knurling.
2 surface purification
Often use solvent cleaning, lye cleaning and heating degreasing methods to remove surface oil, to maintain cleanliness. Commonly used cleaning solvents are: gasoline, acetone, carbon tetrachloride and trichlorohexene. Often used to repair large parts lye cleaning. Lye is usually formulated with sodium hydroxide or sodium carbonate, which is a cheaper method.
3 sand blasting treatment
Sandblasting can make the clean surface to form a uniform and uneven rough surface, in order to facilitate the mechanical bonding of the coating. Using clean compressed air to drive clean sand to spray on the surface of the workpiece can compress the surface of the substrate to remove the oxide film on the surface and cause lattice distortion on part of the surface metal, which is beneficial to the physical combination of the coating. The base metal gives a clean, rough and highly reactive surface after blasting. This is an important preconditioning method.
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