We Care Your Passivation & Electrolytic polishing Solution

Electropolishing and passivation are both effective methods of improving metal corrosion resistance and surface finish. Electropolishing removes a thin layer of metal, leaving a smooth and reflective surface, while passivation creates a protective oxide layer on the surface to improve surface roughness and corrosion resistance.

Introduction to Services

Passivation & Electropolishing of CNC Machined Stainless Steel Parts

- Principle of stainless steel passivation Passivation is a method to change the metal surface into a state that is not easy to be oxidized and slow down the corrosion rate of the metal. Metal corrosion products generated as a result of the action of medium if has compact structure, forming a layer of thin film, tightly covered on the surface of metal, change the surface state of metal, the metal electrode potential jump towards is greatly, and become the passivity of the corrosion, and shows the corrosion resistance performance of precious metals, this layer is called passivation film.
- Principle of stainless steel electrolytic polishing Stainless steel electropolishing is mainly aimed at the surface bright treatment of stainless steel workpiece. The workpiece is cast as the anode, insoluble metal as the cathode, both poles are immersed in the electrolytic cell at the same time, through direct current to produce selective anodic dissolution, the workpiece surface gradually leveled, so as to achieve the effect of increasing the surface brightness of the workpiece.

Description of Type: (Reference Standard: ASTM A967)

Types	Solution (volume percentage)	Solution Temperature (°C)	Minimum Immersion Time (min)	Xavier
Nitric 1	20% - 25% nitric acid and 2.5% + 0.5% of the heavy inscription acid sodium (environmental protection)	50 - 55	20	√
Nitric 2	20% - 45% nitric acid	20 - 30	30	√
Nitric 3	20% - 25% nitric acid	50 - 60	20	√
Nitric 4	45% - 55% nitric acid	50 - 55