Corrosion of aluminum alloy 319.0 help

[AluminumHelp]

Recently, we purchased a relatively brand new high performance car engine to swap with our regular car engine for the purpose of gaining more horsepower. I need to find out the probability of corrosion of an aluminum alloy (possibly 319.0) part of a complete engine block brought to the shop that was not corroded prior to being brought to the shop... but, after two months of storage at the shop, these aluminum parts showed signs of corrosion.

After an ordeal with the shop of over 2 months and upon pickup... these parts were corroded, apparently under normal storage conditions. Is it likely that this type of aluminum alloy can corrode in this amount of time? We have suspicion that the shop has been deceptive and the engine that we were returned in our car after services were rendered is not the engine that we brought to the shop to be swapped... because of this corrosion.

 

[Danger]

Welcome to PF. Are you signed on under 2 usernames, or has someone else of your acquaintance been here already? I ask because this is the second thread on the same topic that has come up in the past couple of weeks. I'm not sure where the other one is, but there are responses to it. Try searching it out.

 

[AluminumHelp]

Yes, we are 2 different people. We are still in the process of getting answers to our questions and I was supposed to post my question somewhere else for more expert opinion on this matter. There was miscommunication. Thanks for your help.

 

[Danger]

Well, I wouldn't call it 'help'. It was more just acknowledging your query. I wish that I really could help, but this is not in my area of experience. My only run-in with aluminum corrosion was learning that you have to use mon-el rivets when attaching aluminum to steel in aircraft construction, to eliminate dielectric interactions that eat the material. This is clearly not applicable to your situation. Good luck, though; you've got some serious experts here who should be responding shortly.