خواندن بعدی
Before the spread of the Internet, everyone dealt with letters and stamps. One of the pastimes of that time was to separate the stamp from the envelope and keep it. I also had a stamp album when I was a …
Definitions of corrosion include: − NACE/ASTM G193: ‘Corrosion is the deterioration of a material, usually a metal, that results from a chemical or electrochemical reaction with its environment.’ − ISO 8044: ‘Physicochemical interaction (often of an electrochemical nature) between a …
It is quite remarkable that only 16, plus a few rare earth elements (REE), of the hundred or so elements …
