Word forms: plural diagnoses. variable noun. Diagnosis is the discovery and naming of what is wrong with someone who is ill or with something that is not working properly. I need to have a second test to confirm the diagnosis. Symptoms may not appear for some weeks, so diagnosis can be difficult.
Definition - What does Copper Corrosion mean? Copper corrosion is the corrosion of materials made of copper or copper alloys. With exposure to atmosphere, copper oxidizes, causing bright copper surfaces to tarnish. After a few years, this tarnish gradually changes to dark brown or black, and finally to green.
Galvanized iron pipes are actually steel pipes that are covered with a protective layer of zinc. Galvanized pipes were installed in many homes that were built before the 1960s. Over many years, zinc erodes from galvanized pipes.ind where your piping enters your home and then scratch it. If the piping is: 1  Copper âthe scratched area will have the look of a copper penny. 2  Galvanized steel âthe scratched area will be a silver-gray color and have threads.