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the friction coefficient of chromate treatment with c2C is much larger than that of chromate treatment with c2D. (3) The use of chromate-treated c2D bolts can reduce the friction consumption of torque on the bolt support surface and thread friction consumption, and obtain greater axial pre-tightening force than c2C chromate-treated bolts, which is useful for saving energy. It is of great significance to improve the efficiency of bolts.

At a certain temperature, C and Cr in stainless steel will form compounds, especially near the grain boundaries, which will cause 'Cr-poor zones' in the grain boundaries, leading to grain boundary corrosion. ④Poor corrosion resistance to CI media (except A4 stainless steel). ⑤The price is higher (about 4 times that of Dacromet). 4.2 Changes in the heat treatment state Steel materials are mainly multi-phase structure (the second phase such as impurities, carbides, intermetallic compounds, etc.

usually exist in the steel as the cathode, and the Fe matrix as the anode). There is a potential difference between the phases in the multiphase structure, forming a corrosion microbattery. The second phase may be the anode-induced passivation phase or the cathode-dissolved phase, both of which will affect the corrosion resistance of the matrix.

For example, machine screw manufacturers must be very carefully welded and heat treated. After high temperature solution treatment, stainless steel is heated between 400C and 850C, and a large amount of CrsC is produced. And Cr, C; carbides will precipitate along the grain boundary, forming a Cr-poor zone near the grain boundary. Carbide is used as the cathode of the corrosion battery, and the Cr-poor area is used as the anode of the corrosion battery, which leads to grain boundary corrosion, and its corrosion resistance will be greatly reduced.

 

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برچسب ها : machine screw manufacturers,
تاريخ : سه شنبه 21 ارديبهشت 1400 | 17:49 | نویسنده : sscrewscnli |