PICKLE & PASSIVATED
Maintenance of stainless steel is an important process to understand, where efforts will be hindered if pickle and passivated process of stainless steel is not undertaken. This is in fact essential since stainless steel can get corroded if there are chances of contamination of the surface. The usage of pickle and passivated process brings chemicals that are applied to the surface of the stainless steel which ultimately removes the contaminations and aids in the building of recurring chromium-oxide. However, it is important to note that the pickle and passivated process are solely utilised for acid treatments and not to remove any grease or oil. If the need is removing of dirt, then options such as the usage of detergents or even alkaline clean before entering the pickle and passivated process is crucial to be aware of.
Pickling
Pickling is generally used to remove high temperature scale and also any adjacent low chromium metal layer from a surface of stainless steel. The stainless steel here is generally heated by welding and treating the steel with heat until it comes to a point where a layer of coloured oxide layer can be noticed. A chromium depleted layer can be seen on the surface of the stainless steel which is below the oxide layer. And it is important to note that, corrosion resistance is low when the chromium content is low. Therefore, in order to bring the best corrosion resistance, the damaged layer of metal should be removed until the point where the fully alloyed stainless steel surface is visible.
Moreover, the benefit of chemical pickling is that unlike mechanical removal, it does not leave particles embedded. Most pickling solutions include the usage of nitric and hydrofluoric acids for the removal of the underlying layer of depleted chromium and the restoration of resistance towards corrosion. Also, the combination of the nitric and hydrofluoric acids can also be used for specialised applications. Therefore, the overall object of pickling brings the removal or the change of dull metals to bring the brightness in them. However, alternative to pickling, the process of electropolishing can also be undertaken, which meets of objectives of removal of metal which however brings bright, smooth and more resistance to corrosion.
Passivation
This brings the treatment of the stainless steel surfaces with acid solutions with the aim of removing contaminants and bring in a more freshly created surface which involves grinding or even mechanical damaging as part of the passivation process. The most common aid used is nitric which cleans the surface from iron contaminants. Moreover, the process of passivation will help in the development of oxide film on the surface of the steel.
Pickle and passivated processes take dangerous acids that can damage both the user and the environment as a result of not handling the acids accordingly and with care. And importantly pickling acids are highly corrosive on carbon steel, therefore it is important to pay close eye when in use. Hence, it is essential to ensure that thorough rinsing of all the acids and as a safety step it is always advisable to use an alkali as a neutraliser before this rinsing process.
Hilite, brings the most professional and expertise pickle and passivated solutions with safety of our staff in mind. This safety and expertise in mind are formulated to bring our customers the best professional service with our operations accessible from Melbourne, Dandenong, Bayswater, Thomastown, and Narre Warren.
WHY CHOOSE US?
Hilite aims to bring the best service closer to you covering regions from Melbourne, Dandenong, Bayswater, Thomastown to Narre Warren. Extending a satisfied customer experience is the foremost intention, Hilite promises this by enabling small to larger volumes of barrel plating made possible under one roof. Our expertise staff at Hilite are more than welcoming to render you the best barrel plating consulting services.
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At Hilite Plating we value the long service of employees as often they are responsible for the best result.
MICHAEL ARUNKUMAR
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