In many cases non-zinc anodes outperform actual zinc anodes, depending upon the type of metal you need to protect and the nature of the water in which the metal being protected is immersed. It all has to do with the voltage of the anode when referenced against a standard.
Chemical engineers use their knowledge of chemistry, physics, engineering and biology to find solutions to challenges involving things like materials manufacturing and food processing.
Chemical engineers work in the biochemical and petroleum industries, and in areas such as energy, nanotechnology, systems engineering, biotechnology and biomedical engineering, and advanced materials processing, as well as overseeing the chemical process in many industries.