1. polishing efficiency, a few minutes can be polished to mirror-bright, and the depth of polishing, and polishing to maintain sheen after a long time unchanged.

2. polishing liquid phosphoric acid content is low, low cost, the more general use of the traditional low slurry more than 30%.

3. polishing current density of small, low voltage, power consumption than traditional low-technology 1 times.

4. polishing fluid management easier to maintain stability.

5. the application of 18-8 type austenitic stainless steel polishing, also applies to Ni-base alloy polishing.

Two, polishing fluid composition and operating conditions

Concentrated phosphoric acid (specific gravity 1.74) 510ml / L 887.4g / L
Concentrated sulfuric acid (specific gravity 1.84) 395ml / L 726.8g / L
WB-260 additive 50ml / L 52.5g / L
Water 50ml / L 50g / L
Best 50-75 ℃ temperature 60-65 ℃
Anodic current density, DA 6-15A/dm2 best 10-12A/dm2
Voltage of 5-8 V
Polishing time for 3-5 minutes
Cathode material of lead or lead alloy
Cathode area: anode area 2-3:1

Three, slotting steps

WB-260 additive is a surfactant, in its use of the early Electropolishing produces a large number of the bubble, so polished and the polishing liquid surface at the top of the distance between the trough should not be ≤ 15cm. For an accurate calculation will be prepared Electropolishing fluid volume, and then under the polishing liquid composition will have to add each component of the polishing liquid in the following order add polishing bed.

1. inject the necessary water.
2. add the required amount of phosphoric acid.
3. remember sulfuric acid diluted with water will release a lot of heat, the sharp increase in solution temperature while stirring add the edge, when the temperature rose to 80 ℃ should be added to stop until the solution after cooling add further to add until all finished.
4. add the required quantity of additives WB-260 while stirring add the edges, add after thorough mixing to ensure uniform mixing.

Four, process

Chemical degreasing → water washing → Baptist acid (1-2% sulfuric acid solution) → → Electropolishing three counter-current washing → Baptist alkali (5% sodium carbonate solution) → water washing → drying or drying
Friday, Bath maintenance and additional

1. stainless steel polishing workpiece into the groove should be preceded by as much as possible will be left on the surface of the water removed from the workpiece entrainment there is too much moisture may cause serious polishing surface pitting, localized erosion caused by the workpiece scrapped.

2. in the electrolytic polishing process, as the anode of stainless steel workpiece, the amount of iron, chromium, nickel changing for the metal ions into the slurry within deposition at the cathode surface. With the polishing process, the metal ion concentration increasing, when reached a certain value, these metal ions to phosphate and sulfate forms from precipitation within the slurry, sedimentation in the trough at the bottom of polishing. To this end, the slurry must be regularly filtered to remove the solid precipitates.

3. in the polishing process is running trough, with the exception of phosphoric acid, sulfuric acid continuously consumed outside the electrolysis of water due to evaporation and loss, in addition, high-viscosity slurry entrainment losses have been workpiece, polishing liquid decreasing surface, need to be polished to Groove additional fresh slurry and water.

4. the polishing slurry, without the original proportion of the pre-1.68, running in the groove polishing process, the proportion of slurry should be controlled at 1.68 ± 0.03 range. Slurry weight and viscosity is too high on polishing liquid water content less than high levels of phosphoric acid or sulfuric acid content is low; the other hand, the proportion of slurry is too low, indicating high water content slurry. Often measured by the proportion of the proportion of slurry is a simple and effective means of control.

5. in the conditional case, the best regular analysis of the acidity of slurry, phosphoric acid and sulfuric acid content.

Six, equipment requirements

Electropolishing liquid mineral acids and is usually at a higher temperature operation, so polished chutes, wash trough, cathode, heating coil and the exhaust device must be made from corrosion resistant slurry material.

1. polyethylene, polypropylene, polyvinyl chloride, epoxy and fiberglass-lined steel trough of the above materials can be used for Electropolishing trough.

2. electric heating or steam heating coil may choose to use the following materials:

⑴ coil PTFE: polytetrafluoroethylene tube-type heat exchanger for steam heating. PTFE tube for electric heating electric heating. Although PTFE coil prices but long life and high electric neutral.

⑵ pure lead or lead-antimony alloy coil: pure lead or lead-antimony alloys Electropolishing can be used as a steam heating coil. Coil to increase the service life, in the slurry liquid and air at the junction should also lead thickening.

⑶ quartz electric heating tube.

3. Rack: Titanium linked with the outer coating of copper sol linked with the longest service life. Due to the polishing liquid is non-chromic acid, phosphor bronze can also be used for linking.