Main physical, chemical and biochemical properties of precious metals (2)
(B) major chemical properties of noble metal is the most important common chemical stability (chemically inert), which is mainly manifested in two aspects - aspects of acid, alkali corrosion and oxidation. A comparison of the corrosion resistance of commonly used chemical reagents is shown in Table 2.
Table 2 Â Comparison of Corrosion Resistance of Precious Metals to Some Chemical Reagents | ||||||||
Reagents and conditions | Au | Ag | Pt | Pd | Rh | Ir | Os | Ru |
H 2 SO 4 | concentrated | A | B | A | A | A | A | A |
HNO 3 | 0.1mol/L | A | B | A | A | A | A |
|
　 | 70% | A | 　 | A | D | A | 　 | C |
　 | 70%10 0°C | A | D | A | D | A | A | D |
Wang Shui | Room temperature | D | D | D | D | A | A | D |
　 | boiled | D | D | D | D | A | A | D |
HCl | 36% room temperature | A | B | A | A | A | A | A |
　 | 36% boiled | A | D | B | B | A | A | C |
Cl2 | dry | B | 　 | B | C | A | A | A |
　 | wet | B | 　 | B | D | A | A | C |
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