What is the structural or environmental effect of corrosive water.
Dear Emmanuel,
Corrosive water is a very broad term. In the corrosion standards corrosive water is defined as a water which contained 100 ppm of chloride and 100 ppm of sulfate as a sodium salt, with dissolved oxygen from the air. In practice corrosive water composition can significantly vary. Structural effect depends on the materials, some non-noble metals will usually uniformly corroded (Fe, Zn Cu etc), and a passive metals e.g. aluminum, stainless steel can undergoes pitting or crevice corrosion. In some cases, for example hot-deep galvanized steel with zinc, corrosion will be the fasted in distilled water, carbonate and bicarbonate will lower the corrosion rate (film-forming inhibitors), Environmental issue can not be simply explained.
Sincerely
prof. Grgur
Dear Nleonu
In a simple language, the PH of the corrosive water and the corrosion potential,i.e., open circuit potential, of the sample in the corrosive water would deternine if the sample is susceptible to corrosion or not. In other words, from Pourbaix Diagram( Measured corrosion potential of the sample in the water versus Measured PH of the water ), one can deternine if the sample is susceptible to corrosion or not. Refer to the Link:
( https://en.wikipedia.org/wiki/Pourbaix_diagram ) .
- Badges
- Science topic