side impact beams

Passivation is a kind of passive film, due to the effect of metal and oxide, the passive film on the metal surface is very thin, dense, good coverage, strong adsorption. Is usually a metal oxide, usually of metal oxide compound. It will be completely separate metal and corrosion media, prevent metal contact with the corrosive medium, to dissolve metal ground to a halt, passivity, anti-corrosion effect.
After passivation, not an increase of 304 stainless steel tube side impact beams thickness, change color, improve product precision and added value, make the operation more convenient; Passivation process has no reaction, passivator reusable, long service life and cost more economy; Passivation promote oxygen molecules structure metal surface passivation membrane, membrane layer density, stable performance and repair in the air at the same time, the rust-proof method compared to the passivation film is more stable, resistant to corrosion.
But it is important to note that if the 304 stainless steel tube surface dirt before passivation, and should be mechanical cleaning, then oil removal. If the passivation liquid cannot remove oil on the surface of the oil will affect the quality of the passivation. Therefore, you cannot omit oil and removal. Oil and removal can be used in lye, emulsifier, organic solvent and steam.
For passivation solution, HNO3 should be controlled between 20% ~ 50%. According to the electrochemical test, HNO3 concentration less than 20% of the passivation film quality is not stable, easy to produce pitting, but should not be greater than 50% HNO3 concentration, to prevent excessive passivation. If 304 stainless steel tube surface after pickling passivation spots or side impact door beams stains, available fresh passivation solution or high concentration of nitric acid scrubbing. Eventually passivation of stainless steel pipe should be pay attention to protect, use polyethylene film or dress, avoid different metal and nonmetal contact.
Stainless steel pipe not rust, so need passivation 304 stainless steel tube? Stainless steel pipe need passivation, on the basis of the original rust do a layer of passivation film. After the passivation of stainless steel can be on the basis of the original antirust increased 3 ~ 8 years, greatly reduces the probability of rust.
When many people see: 304 stainless steel pipe is used in indoor or indoors? May think this is used in indoor is a good choice, of course, for this statement, correct or not, so to speak, why so? If adopted 304 stainless steel pipe is the use of service pipe class, so, interior and interior is can use, because of the corrosion resistant performance is good, not easy to rust, is building water supply of high quality pipe.
But if 304 stainless steel pipe is used for other purposes (except water), so its use is mainly outdoor, for example, decoration class use stainless steel tube, and the use of stainless steel tube in 304 stainless steel aluminium coated steel tube pipe is used, the main choice for outdoor use 304 material is to prevent corrosion, such as material 201 won't be used in outdoor, because the effect of its resistance to corrosion is lower than 304 for outdoor easy to rust.
At the same time, with the common development of the stainless steel tube, a lot of home outfit in the pipe when using building materials, industrial building materials, the application of stainless steel pipe in the use of mechanical equipment is a necessary cannot: environmental, health, easy to clean, will not produce harmful substances, at the same time, more information about the material of stainless steel pipe also be excavated one by one, such as 304 l, 316, 316 l, 2205, S3180... And so on, their performance has the corresponding function for different occasions, and anticorrosion ability is stronger. Through the following answer, I believe all the application of 304 stainless steel tube and have a new understanding, pay attention to small make up, bring different pipeline knowledge every day!