Chemical polishing is the smoothing of the metal surface by regular dissolution. In the chemical polishing process, the passivation oxide film and the oxide film are continuously formed on the surface of the steel parts, and the former is stronger than the latter. Overview Modification of the surface of a workpiece using a flexible polishing tool and abrasive particles or other polishing media. Polishing does not improve the dimensional accuracy or geometric accuracy of the workpiece, but is intended to achieve a smooth surface or specular gloss, and sometimes to eliminate gloss (extinction). A polishing wheel is usually used as a polishing tool. The polishing wheel is generally formed by stacking a plurality of layers of canvas, felt or leather, and the two sides are clamped by a metal circular plate, and the rim is coated with a polishing agent uniformly mixed with fine powder abrasive and grease. During polishing, the high-speed rotating polishing wheel (circumferential speed of 20 m / sec or more) is pressed against the workpiece, causing the abrasive to roll and micro-cut on the surface of the workpiece, thereby obtaining a bright machined surface with a surface roughness of Ra0.63. ~0.01 microns; when a non-greasy matting finish is used, the shiny surface can be matted to improve appearance. When mass producing bearing steel balls, the method of barrel polishing is often used. During rough polishing, a large number of steel balls, lime and abrasive are placed in the inclined can-shaped drum. When the drum rotates, the steel ball and the abrasive are randomly rolled and collided in the cylinder to remove the surface convex surface and reduce the surface roughness. The purpose is to remove the margin of about 0.01 mm. In the case of fine polishing, steel balls and fur fragments are placed in the wooden barrel, and the surface is rotated for several hours to obtain a dazzling surface. The polishing of the precision ruler is carried out by immersing the processed surface in a polishing liquid, and the polishing liquid is prepared by mixing chrome oxide fine powder having a particle size of W5 to W0.5 and an emulsion. The polishing wheel is made of finely degreased wood or special fine felt. The movement track is uniform and dense mesh. The surface roughness after polishing is not more than Ra 0.01μ, observed under a microscope magnified 40 times. Not any surface defects. In addition, there are methods such as electrolytic polishing.
Chemical polishing mechanism Chemical polishing is the smoothing of the metal surface by regular dissolution. In the chemical polishing process, the passivation oxide film and the oxide film are continuously formed on the surface of the steel parts, and the former is stronger than the latter. Due to the microscopic inconsistency of the surface of the part, the microscopic convex part of the surface is preferentially dissolved, and the dissolution rate is greater than the dissolution rate of the concave part; and the dissolution of the film and the formation of the film are always performed simultaneously, but the rate is different, resulting in the surface of the steel part. The roughness is leveled to obtain a smooth, shiny surface. Polishing can fill surface pores, scratches and other surface defects, thereby increasing fatigue resistance and corrosion resistance.
Chemical polishing process chemical (or electrochemical) degreasing → hot water washing → flowing water washing → descaling (10% sulfuric acid) → flowing water washing → chemical polishing → flowing water washing → neutralization → flowing water washing → transfer to the next surface treatment process chemistry Chemical polishing of steel parts after polishing can be used as a pre-treatment process for protective decorative plating, or as a pre-treatment process for chemical film formation such as phosphating. If it is not applied by electroplating or chemical film formation, it can be sprayed with amino varnish or acrylic varnish, which has better protective decorative effect after drying. If the rust-proof passivation solution is immersed before painting, the corrosion resistance will be further improved.
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