Surface morphology:

    1, the impact of mechanical polishing. Austenitic nickel-chromium stainless steel, such as 1Cr18ni95Ti mechanical polishing, abrasive alone under the pressure of a large directional leveling the surface, so the surface there is a certain plastic deformation organizational characteristics - fibrous tissue that 拜尔培 layer.

    2, electrochemical polishing effect. Ma Shengli and other studies 1Cr18ni95Ti stainless steel in phosphoric acid / sulfuric acid system electrolyte surface after electrochemical polishing organized by the typical uniform and dense fibrous tissue into granular grain morphology. This is obviously related to the mechanism of the polishing process.

    Usually when a current through the electrolyte, the stainless steel on the anode, a metal surface micro convex protrusion preferential dissolution occurring phenomenon, and microscopic grains of different crystal faces dissolution rate is not the same, thereby resulting in grain boundaries. But there are very different conditions in different electrochemical polishing surface microstructure morphology. As 65% (wt) aqueous electrolyte when the anode current density of 30A / dm2, t is polished at 70 ℃, 15min, achieve better surface finish. When the anode current density (DA) through the bottom (DA <20A / dm2 = or too large (DA <40A / dm2
), Or the temperature is too high (> 90 ℃) or too low (<50 ℃ =), or polishing time is too long (> 25min) or too short (<10min), are not conducive to improving the quality of the surface finish.