Stainless steel surface with the dust of the impurities Production is often with the help of dust venue, often uns s32750 sheet with a lot of dust in air, they constantly fall on the surface equipment. They can use water to get rid of or alkaline solution. However, there is adhesion of dirt need high pressure water or steam to clean up.
Stainless steel surface with the impurities of iron powder
As standard A380 [3] notes if the rust test solution can't clear clean, all on the surface of the craft that equipment is not recommended, namely to produce human consumer direct contact surface using this test method. Relatively simple test method is exposed 12-24 hours in the water, check for a rusty spot. This kind of test sensitivity is poor, and time-consuming. These are test, not a cleaning method. If found to have iron exists, must use the introduction of the chemical and electrochemical methods to clean up. Stainless steel surface with paint, chalk and markers of impurities
The impact of these pollutants is similar to the influence of oil x56 line pipe and grease. Suggest using a clean brush or clean water or alkaline detergent for washing, also can use the high pressure water or steam flushing.
Stainless steel surface with the flux of impurities Use flux for welding process with manual welding, flux core arc welding and submerged arc welding, the welding process can leave fine flux grains on surface, ordinary cleaning method can't clear them away. These particles will be the source of corrosion, crevice corrosion mechanical cleaning methods to remove the residual flux must be used.
Deposited on the surface of the stainless steel contain other metal elements of attachments, or heterogeneous metal particles of dust in the humid air, attachments and stainless steel, the condensed water between the both together as a micro battery, triggers the electrochemical reaction, protective film is damaged, to call the electrochemical corrosion.
Stainless steel surface adhesion organic fluids (such as melon 321 stainless steel sheet seeds, noodle soup, sputum, etc.), under the condition of water is oxygen, organic acid, organic acid to for a long time and are on the surface of the metal corrosion. Stainless steel surface adhesion containing acid, alkali, salt substances (e.g., decorate the walls of caustic soda and lime water splash), cause local corrosion. In pollution in the air (e.g., contains a lot of sulfur, carbon oxide, atmospheric nitrous oxide), in the condensation water, formation of sulfuric acid, nitric acid, acetic acid, liquid, chemical corrosion.