446 stainless steel wire, serious corrosion
446 stainless steel wire, serious corrosion
(OP)
hi,
guys, i need your help.
i have a terminal, there is 3 pins in it and they are made of copper core wire with jacket 446 stainless steel.
the terminal was returned from one customer, and it was found that one of the pins was broken. on the broken pin's surface , i found serious corrosion as the attached photo shows.
BTW, the terminal was used in refrigeration compressor.
can anyone give me some suggestion why this could happen, and how? also, any good ways to prevent it to happen?
thanks in advance.
guys, i need your help.
i have a terminal, there is 3 pins in it and they are made of copper core wire with jacket 446 stainless steel.
the terminal was returned from one customer, and it was found that one of the pins was broken. on the broken pin's surface , i found serious corrosion as the attached photo shows.
BTW, the terminal was used in refrigeration compressor.
can anyone give me some suggestion why this could happen, and how? also, any good ways to prevent it to happen?
thanks in advance.





RE: 446 stainless steel wire, serious corrosion
RE: 446 stainless steel wire, serious corrosion
The condition of the 446 may have been wrong in the first place.
Or they may have exposed it to very aggressive chemicals and they don't want to mention it.
What refrigerant is in the compressor?
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Plymouth Tube
RE: 446 stainless steel wire, serious corrosion
according what i know, the refrigerant is R22. and the compressors were used in train, which was located on the top of it.
eds test was done, and it is shown in the attached file. the photo is in BEC mode. and the pin was Electronless Nickel plated. you should know that there was discharge, may be continuous discharge in service, and the results was in some location of pin, the pin was melted, which also shown.
i will do micro-structure examination.
RE: 446 stainless steel wire, serious corrosion
RE: 446 stainless steel wire, serious corrosion
RE: 446 stainless steel wire, serious corrosion
yes, it could be. indeed, it is sure that there was electric arc during service.
RE: 446 stainless steel wire, serious corrosion
RE: 446 stainless steel wire, serious corrosion
1. a poor fit to the female connector (either size or not fully engaged) (mechanical)
2. electrical overload (electrical)
3. surface corrosion that raised resistance and lead to arcing (corrosion)
Look at the other pins for signs of corrosion or arcing.
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Plymouth Tube
RE: 446 stainless steel wire, serious corrosion