Passivation is a widely used word on the Google. Many people, though involved in the industry related to passivation, don't understand the full implications of it. Generally, people working in the machine shops or other manufacturing units look out for passivate coating on their machines and spare parts.
Most machines are made of iron, iron ores or stainless steel. Such units are very venerable to erosion as they are routinely exposed to water and other wet material. Yes, even stainless steel needs this protective coating in order to work for a longer duration.
Many purchasing agents, machine shop owners, and engineers overlook the need of nitric acid passivation and are in a complete dark about knowing the relationship between chemical passivation and corrosion resistant.
Some also believe it to be a cleaning process that is required only after the machines are in operation for more than 5 years.
Chemical or citric acid passivation increase the corrosion defiant properties and form a transparent and thin film on the metal. And it surely works. If you do verification tests, that include immersing the metal in the copper sulphate solution or spraying liquid full of salt under high humid conditions, you would be able to see how well your machine is protected against the corrosion.
The aerospace industry, medical and electronic industries routinely demand their machine parts to be passivate after every few months as this ensures smooth running of all the machinery. The demand of the maximum performance from these industries can't be ignored and therefore passivation becomes a necessity.
In this process, the exogenous iron or iron compounds are removed from the stainless steel by using chemical dissolution.
Some experts point out the need of treating the machine or its parts with acid simultaneously. If such a process is not carried, the free iron that grabs the surface will leave behind a contamination and result in permanent corrosion.
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