How do steel fasteners resist rust?
Steel fasteners is the fasteners, which are two or more parts fastened to become a whole when used in a class of mechanical parts of the general term. Because of the wide range of applications in industrial production, known as the rice of industry. Fastener varieties of specifications, performance and use of different, and standardization, serialization, generalization of a high degree. How to do a good job of protecting steel fasteners against corrosion?
Steel fasteners corrosion protection measures
1) Improve the fastener surface treatment process. According to the test results, in the marine environment, cadmium-plated corrosion resistance is significantly better than the galvanized process. Therefore, the zinc-plated passivation process can be used for washers, bolts are changed to cadmium-plated passivation process for surface treatment.
2) Fastener hole wall surface protection. For the aluminum alloy structure without surface treatment of fasteners hole wall, the use of Alodine surface treatment, and then coated with a layer of anti-corrosion primer. For the steel structure without surface treatment of fasteners hole wall, apply a layer of phosphating primer.
3) Fastener wet assembly. Fastener hole wall primer curing, the use of grease on the fastener wet assembly. The use of grease assembly can not only play a sealing effect, to prevent media penetration into the gap. And fasteners are easy to disassemble, easy to field construction.
4) Spray corrosion inhibitor. Fasteners to complete the assembly, fastening connection area surface spraying 1 layer of soft film water replacement type corrosion inhibitor. Corrosion inhibitor is an important means of corrosion prevention and control, with good permeability and water displacement, can quickly penetrate into the aircraft structure inside the gap, the gap and the metal surface of the water displacement to the outside, so that the metal and water isolation. At the same time in the metal surface deposited on a layer of protective film, effectively delay the occurrence of corrosion of metal materials.
