Category Archives: passivation

Food Equipment Passivation

FDA food industry recalls happen for a variety of reasons. It is difficult to foresee every potential problem but it is possible to take protective measures against chemicals harboring themselves inside of empty space in your stainless steel. One such protection against  is food equipment passivation. Passivating your food equipment will help protect against corrosion and help provide a longer “shelf life” for your food equipment.

After your stainless steel food equipment is put to use, it can begin to wear down. This can happen by an abrasive process such as grinding or brushing your equipment. It can also happen due to chemical reactions, the chemicals in your food reacting with the stainless steel. Over time these processes wear at the “passive” layer of stainless steel. The process of passivation helps to secure this layer for uniformity and corrosion resistance.

– 3A Standards also provide specifications regarding alloys and other coatings used in fabrication. The properties of stainless steel can change with continued use, especially under conditions where the chromium oxide layer is altered (e.g. incompatible cleaners, abrasive cleaners, abrasive cleaning pads, or chlorine and related sanitizers). Therefore, it is recommended that surfaces be passivated (using nitric acid or other strong oxidizing agents) initially and on a regular frequency thereafter, to maintain a passive (non-reactive) oxide film on the surface. Passivation of stainless steel food contact surfaces is recommended after any surface repair, polishing, or working. –

Please contact Classic Electropolishing for help with food equipment passivation.


What is the cost of Stainless Steel Corrosion?

Passivation is a post production metal finishing process often done on stainless steel products. Since there is a cost to passivate your products often times device designers will take a short cut and not get their products passivated or electropolished. Skipping passivation comes at a price since corrosion can take place over a long period of time. What is the cost of stainless steel corrosion?

While potentially biased, NACE International, the Corrosion Society estimates the worldwide annual cost of corrosion at $2.2 trillion, more than 3% of global GDP. At Classic Electropolishing we don’t completely agree with this number but we do agree that stainless steel corrosion comes at a large cost to product decay. Improve the lifetime of your products and decrease your worry with passivation and electropolishing. 

One of the most susceptible industries to corrosion is offshore drilling and oil. The combination of high winds, harsh weather and salt water can be brutal on unprotected structures. Classic electropolishing provides passivation and electropolishing to protect against the harshest of elements. Contact us today to find out about our high quality services.


Citric Passivation vs. Nitric Passivation

We get many requests for both citric passivation and nitric passivation so we wanted to dispel the myths and help with your next project. Passivation is the act of becoming passive, that is, being less affected by environmental factors such as air and water. Most finishers will push you towards citric passivation and here is why. 

The benefits of citric passivation are both economical and environmental. Citric passivation is the more environmentally conscious choice. Nitric passivation solutions emit toxic gasses and must be handled and disposed of properly to avoid any environmental affects. Citric passivation solutions can be easily disposed of.

Citric passivation is more affordable. The citric passivation process takes less time overall. Combine this with the handling costs and the fact that less citric solution is needed with the process and you can get large pricing discounts by going with citric passivation.

Many of our customers also need help differentiating electropolishing and passivation so we made a little guide electropolishing vs. passivation. Let us quote out your next metal finishing project.