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2. Rouging - Wikipedia

   en.wikipedia.org/wiki/Rouging

   Rouging is a form of corrosion found in stainless steel. [1] It can be due to iron contamination of the stainless steel surface due to welding of non-stainless steel for support columns, or other temporary means, which when welded off leaves a low chromium area. [2] There are three classes of rouging: Class I, Class II, and Class III. [3]

3. Crevice corrosion - Wikipedia

   en.wikipedia.org/wiki/Crevice_corrosion

   In general, crevice corrosion is of greatest concern for materials which are normally passive metals, like stainless steel or aluminum. Crevice corrosion tends to be of greatest significance to components built of highly corrosion-resistant superalloys and operating with the purest-available water chemistry.

4. Pickling (metal) - Wikipedia

   en.wikipedia.org/wiki/Pickling_(metal)

   In order to remove the scale the workpiece is dipped into a vat of pickle liquor. Prior to cold rolling operation, hot rolled steel is normally passed through a pickling line so as to eradicate the scale from the surface. The primary acid used in steelmaking is hydrochloric acid, although sulfuric acid was previously more common. Hydrochloric ...

5. Stainless steel - Wikipedia

   en.wikipedia.org/wiki/Stainless_steel

   Stainless steel, also known as inox, corrosion-resistant steel (CRES), and rustless steel, is an alloy of iron that is resistant to rusting and corrosion. It contains iron with chromium and other elements such as molybdenum , carbon , nickel and nitrogen depending on its specific use and cost.

6. Bluing (steel) - Wikipedia

   en.wikipedia.org/wiki/Bluing_(steel)

   Similarly, stainless steel parts may be immersed in a mixture of nitrates and chromates, similarly heated. Either of these two methods is called 'hot bluing'. Hot bluing is the current standard [ 7 ] in gun bluing, as both it and rust bluing provide the most permanent degree of rust-resistance and cosmetic protection of exposed gun metal, and ...

7. Chromate conversion coating - Wikipedia

   en.wikipedia.org/wiki/Chromate_conversion_coating

   Chromate conversion coatings are usually applied by immersing the part in a chemical bath until a film of the desired thickness has formed, removing the part, rinsing it and letting it dry. The process is usually carried out at room temperature, with a few minutes of immersion.