The metal reacts with oxygen in the atmosphere to form an oxide film on the surface. Iron oxide formed on ordinary carbon steel continues to oxidize, causing corrosion to expand and eventually form holes.
Paint or oxidization-resistant metals (e.g., zinc, nickel, and chromium) can be used to coat carbon steel, but this protection is only a thin film. If the protective layer is damaged, the steel below begins to rust.
The corrosion resistance of metal hose fittings depends on the content of chromium. When the amount of chromium is added to 10.5%, the atmospheric corrosion resistance of steel increases significantly. However, when the content of chromium is higher, although the corrosion resistance can still be improved, it is not obvious. The reason is that when the steel is alloyed with chromium, the type of surface oxide is changed to a surface oxide similar to that formed on the pure chromium metal. This tightly adhered chrome - rich oxide protects the surface against further oxidation.
This oxide layer is extremely thin, through which you can see the stainless steel surface of the natural gloss, making the stainless steel has a unique surface. Moreover, if the surface layer is damaged, the exposed steel surface will self-repair with the atmospheric reaction, re-forming this "passivating film", continuing to play a protective role.
How is the metal hose fitting installed?
Corrugated metal hose connector installation, the corrugated pipe is special cutter to cut into the length that you need, again with a special filter the pipe into the wave device, use a hammer to knock a few times, had pulled out the pipe on one side of the watch head drawn, and then put in two nuts, two start cap to reverse the put, put the other end in the same way to knock flat, in the end, when we put a gasket will become.
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