Bad Voltage regulator causes corrosion

I had recently had a battery fail.  My thinking was that it was a junk battery from advance auto.  There was battery liquid venting and causing corrosion around the battery tray and inner wing.  Turns out the voltage regator failed and the alternator was sending 17.6 volts to the battery...battery boils over from over charging and the acid starts corroding the metal around the battery.  The voltage regulator came from NAPA and I got it installed in 5 min.  Now it charges at around 14 volts. Job done.