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From the inspection and clear the rust stain out, it is found that Rust stain caused a similar liquid with metal powder contamination is from time to time, thus making metal powder forming, by those rusty liquid medium has evaporated completely.Then the fire with PMI found are stainless steel. The rust happened not born meat stainless steel. But is that the metal powder to the contamination on the ring. The ask for some content assembly for the data.1) characteristics of rust, caused a Uniform Rust. Which is not characteristic of rust in the เตนเลส. (corrosion of stainless steel is the rust hollow under the skin with the hole a little).2) various metal type two types when touching each other. Whether through a medium with a liquid or touch each other directly. The inferior (in which the metal powder contamination in liquid) that will act as a negative charge to the anode โดยจ่ line, which makes the metal inferior that lose flesh. Or if said is simple. If carbon steel and stainless steel in contact with each other. Carbon steel to rust faster than before due to being catalyzed by voltage of two metal type, which will be called Bimetallic. Corrosion.3) rust this style has no effect on the chromium oxide film on the surface of stainless steel (passive film). Because the mechanism of this film. When iron containing chromium exposed to oxygen can be Cr2O3 or call in his mouth that chromium film. By the terms of this film. When destroyed, whether any way. But in the end the skin is exposed to oxygen, it will be a chromium oxide.Conclusion this issue is caused by fluid containing alloy, sir. But to the contamination on meat stainless steel can rust from what to put on the skin of the contamination that ring เมื่อสา them dry. And the lack of checking every piece before the pack from the warehouse.
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