GKVAC uses the GKVAC process to achieve the optimal electronic polishing results of all structures made of stainless steel through electrochemical action. The surface roughness obtained by electronic polishing  can be reduced to or below the specified surface finish standard.

Electronic polishing is to dissolve the metal surface to a limited depth. By using the current transmitted by the electrolytic solution, the surface finish is subject to electrochemical treatment. The final finish result meets or exceeds the customer's surface requirements. Although mechanical polishing can minimize the surface roughness, there're great limitations on mechanical polishing to obtain the advantages of electronic polishing.

The basic principle of electronic polishing (as shown in the figure) is a method of electrolysis between the product  (anode) and the corresponding electrode (cathode) to polishing the metal surface. Therefore, the components and processing methods of the device are very simple in principle. As shown in the figure, a product to be ground is filled in the electrolytic tank as anode, and a cathode insoluble in the polishing fluid is provided. A result is obtained by passing direct current. However, in practice, a large number of technologies are required, such as the composition of the polishing fluid, temperature management, and the configuration of the object and cathode.

The purpose and effect of electronic polishing are as follows:

◾Clean surface

◾Prevent oxidation

◾Prevent adsorption

◾Reduce surface area

◾No processing metamorphic layer.

◾No thermal effects.

◾Excellent gloss and smoothness.

◾Improved corrosion resistance.

◾Adaptable to products with a complex shape.

◾Improved cleanability, cleanliness and non-adhesion.

The materials suitable for the electrolytic method are the stainless steel 304, 304L, 316, and 316L of the AUSTENITE series. Special electrolytes are adopted by other stainless steel 200 and 400 series. Because of the inconsistent supply and demand, they are rarely used.

* 1 Need to design electrode

* 2 Possible to use tools

* 3 The surface is beautifully scratched and glows

The vertical axis is the atomic percentage, and the horizontal axis represents the measured depth. At a depth of 10.4Å (Ohmstrom), the chromium concentration is 1.6 times that of iron.

From 18% chromium concentration to more than 60%, chromium concentration is to manufacture stainless steel surfaces that are not easy to corrode.

Chemical passivation of nitric acid, etc. is caused by contact between a metal (solid) and a chemical (liquid). So, the quality of passivation is influenced by obstructions such as small bumps, bubbles, oil, or foreign substances on the metal surface. To perform passivation more effectively, the passivation effect will increase after electronic polishing.

In electronic polishing, the dissolution and oxidation (passivation) on the metal surface proceed simultaneously, and the obstacles are excluded. In addition, because the thin part of the passivation layer will be passivated first, a tight and uniform passivation layer can be formed.

The test methods include visual, chemical and physical methods. When GKVAC requires tests more precise than the company's test standards, we can use physical objects and test blocks, and cooperate with recognized external agencies to meet customer needs.

◾Surface roughness: Roughness change
◾Cleanliness: Particles, organic chemicals, oil, etc.
◾Surface composition analysis: Surface atomic change

The main procedures are different depending on the purpose and product status, and the processing procedures are also different, generally the following procedures are used.