【 HRB bearing common sense 】 The commonly used several kinds of surface protection technology, it is worth learning

There is rotational, have HRB bearing ( ) Jiaxing bearing group sales co. , LTD. ( The company) Is bearing group co. , LTD. Established in jiaxing spot sales window, specializing in HRB brand bearings, facing the whole country, the existing stock 50 million yuan, covers the whole bearing, have very strong spot supply, is the group's retail sales center. （ A) Adopt the method of electrolytic plating in matrix ( After pretreatment) Sedimentary needed to cover the surface of the process known as electroplating. Electroplating is of a very old traditional technology, widely used in the permanent decoration and protection. Can be divided into single metal plating, electroplating multilayer composite plating, and alloy plating, etc. There are many factors affecting the quality of coating, such as: plating pretreatment, plating solution way of purification and degree, the rationality of the way to the plating, the plating solution system set up, the determination of composition and thickness, the process parameters ( PH, temperature, current density) , additives ( Brightening agent, leveling agent, in addition to the stress agent, wetting agent, dispersant) , analysis of plating solution and the complement system, operating system, post-treatment of plating ( To hydrogen, closed) And so on. Due to the plating three wastes pollution to the environment and the influence is healthy, environmental protection departments around the increasingly strict management, many enterprises do not set electroplating workshop, but to professional factory, The workshop) Processing. In order to ensure the quality of the chrome, should according to relevant standards and regulations for the appearance, adhesion and thickness of the coating, porosity and corrosion resistance by specific request. Once the acceptance or use of quality problems, to facilitate quality accident analysis and improvement. （ 2) Oxidation oxidation treatment are divided into ferrous oxide and non-ferrous metal oxidation treatment, this involves only the former. The steel and alloy oxidation treatment, also called blue or black finish. Because of its low cost, high efficiency, achieved fast and stable process, easy operation and simple equipment, use very extensive. Alkaline chemical oxidation alkaline oxidation is the most commonly used method, it is under the high temperature, in naoh solution containing a certain antioxidant. Antioxidants and hydroxide react with metallic iron and steel eventually form iron oxide ( Fe3O4) As the main composition of the oxide film. Color of membrane depends on the surface of the parts, alloy composition and process conditions of oxidation treatment, usually is black or black. The film thickness of 0. 6 ~ 0. 8um. Chemical reaction order is no ferrous form acid sodium ( Na2Fe02） And ferrite, Na2Fe204) And then formed from ferrous iron acid sodium and sodium acid reaction Fe304 oxide film. Equation is as follows: 3 fe + Na02 + 5 na0h & rarr; 3Na2Fe02+H20+NH3↑ 6Na2Fe02+NaN02+5H20→ 3Na2Fe204+7Na0H+NH3↑ Na2Fe02+Na2Fe204+2H20→ Fe304 + 4 na0h above if you are interested in jiaxing bearing group co. , LTD. The author introduces the information or have any questions, please click on the website on the right side of the online customer service or call:, you close the way of jiaxing bearing purchasing advisors. - - - - - - Editor: jiaxing bearing sourcing consultant LTD. All rights reserved, The company) Reprint please indicate the source