Surface finishes


Passivation & Electrolytic polishing services

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.

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Part surface treatment

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)

  • Stainless steel nitric acid passivation type
TypesSolution (volume percentage)solution temperature(℃)Minimum immersion time(min)Xavier
Nitric 1 20% -25% nitric acid and 2.5% + 0.5% of the heavy inscription acid sodium (environmental protection)50-5520
Nitric 220%-45% nitric acid20-3030
Nitric 320%-25% nitric acid50-6020
Nitric 445%-55% nitric acid50-5530
  • Stainless steel citric acid passivation type
TypesSolution (volume percentage)solution temperature(℃)Minimum immersion time(min)Xavier
Citric 14%-10%citric acid60-714
Citric 24%-10%citric acid49-6010
Citric 34%-10%citric acid20-4920

Critical items


Non standard requests

* We offer ASTM A967 passivation standards. If you have specific requirements, please contact

**Passivation test methods: boiling water test, wet cloth test, temperature test, water immersion test, salt spray test, wet copper sulfate test.

Electropolishing parts

Stainless steel passivation & electrolytic polishing ability


stypeNitric acid passivation、Citric acid passivationElectrolyte polishing
base materialStainless steel series300 series stainless steel
standardASTN A967GB/T 20016
Maximum machining size(cm)100*45*80100*45*80
Unit Max Weight(kg)8050
colournatural colorgloss white 
test methodBoiling water test, wet cloth test, temperature experiment, the water immersion test, salt spray test, humid copper sulfate test experimentdimensional gauging,Appearance instrumentation
stainless steel electropolishing rmax

Roughness change of stainless steel electropolishing

Before electropolishing: roughness distribution in 1.0-3.0um. After electropolishing: roughness distribution within 0.3um. The size of electrolytic polishing will only be reduced, and the range of reduction is uncertain. The size of products with better roughness will be thrown off within 10um, and those with larger roughness will be thrown off dozens of um. 

⑴The color inside and outside is consistent, the luster is long-lasting, and the recesses that cannot be polished by mechanical polishing can be smoothed.
⑵High production efficiency and low cost.
⑶ Increase the corrosion resistance of the workpiece surface.



We have high standards for Part surface treatment

We manufacture your custom parts according to strict manufacturing standards and ensure all parts and processes adhere to the Xavier Standard. A thorough verification of these requirements is included in our inspection report that we ship with every order.

  • Standard 1
    PO consistent

    We ensure that every part after machining is as specified in the PO as customer requirements.

  • Standard 2
    Quality check

    Prior to MP shipment to ensure that each part meets order specifications and Xavier standards.

  • Standard 3
    Require consistent

    Ensure conformance of parts and any required documentation prior to dispatching the order.

What They Say Our Clients About Us


The feedback they provide is invaluable. These reviews not only help us understand our customers' needs and expectations, but also guide improvements and optimization of products or services.

Alexa Loverty Alexa Loverty

Alexa Loverty

Chief designer

The sample has been received and it looks spectacular! In particular, the surface finishing is very nice and the finished piece feels wonderful in hand. We are very please with the result of your work. 

Alexa Loverty
Maxine Butler Maxine Butler

Maxine Butler


We did a quick build test of all versions and the looks, performance specs and functionality were good, and they worked just as well, as always. Delivery date no problem!

Maxine Butler
Dean Miler Dean Miler

Dean Miler


We placed our first order of 1500 stainless steel parts from Xavier and all parts of the sample were great, assembled correctly and we are very happy with the material and finish.

Dean Miler