It is non-corrosive to concrete and tends to be effective over a longer duration.

They just put a bandaid on each time until the condenser coils needed replaced due to corrosion but they tried to say it could be cleaned which was my responsibility, they were out at least once a year. 

I heard a leak and after some detective work and cutting open the back of my kitchen cabinet I finally have located a few pin holes at the bottom of a kitchen copper drain line.These pin holes unfortunately are impossible to patch in that the cause is corrosion and is almost always caused by tenants or previous owners sending hazardous chemicals like Draino down the line and those chemical sat at the bottom and ate at the line and eventually you get holes.

The hardest part would be if the old drain wouldn't unthread from the shoe below due to corrosion but I was able to get it out without too much elbow grease.

Most areas have hard water and the scale will build up in the hot heater as the water evaporates from the system thus causing corrosion to the hot heater elements.

Look for mold issues and corrosion.Fire/smoke can be corrosive, so it can have a huge impact on anything that is metal within the structure.  

Galvanized steel, if used, could cause you a big headache in the long run due to rusting/corrosion issues. 

Soot is corrosive, it is possible that almost anything metal will become pitted and need to be replaced.  

Age or corrosion are not damage.

as the home was built in 1923)-Slight cracking on the foundation on a part of the house (the pre-inspection noted it is common in older homes and not a big concern)-the plumbing had signs of corrosion which is why the inspector made the note of leaks at some time.