INCONEL825与INCONEL625耐蚀性比较

各位大师有没有哪位知道INCONEL825与INCONEL625哪个耐蚀性更好点？也就是哪个腐蚀率更低些？

主要成分;
INCONEL825：40Ni-21Cr-3Mo-2Cu-Ti
INCONEL625：62Ni-22Cr-9Mo-3.7Nb-Ti，Al

625：
Aqueous Corrosion
The high alloy content of INCONEL alloy 625 enables it to withstand a wide variety of severe corrosive environments. In
mild environments such as the atmosphere, fresh and sea water, neutral salts, and alkaline media there is almost no attack. In
more severe corrosive environments the combination of nickel and chromium provides resistance to oxidizing chemicals,
whereas the high nickel and molybdenum contents supply resistance to nonoxidizing environments. The high molybdenum
content also makes this alloy very resistant to pitting and crevice corrosion, and niobium acts to stabilize the alloy against sensitization
during welding, thereby preventing subsequent intergranular cracking. Also, the high nickel content provides freedom
from chloride ion stress-corrosion cracking.
This combination of characteristics makes INCONEL alloy 625 useful over a broad spectrum of corrosive conditions. For
instance, it has been recommended as a material of construction for a storage tank to handle chemical wastes, including
hydrochloric and nitric acids — chemicals which represent directly opposite types of corrosion problems. Materials which
resist either one of these acids are normally severely attacked by the other.
More general information may be found in the publication ‘High Performance Alloys for Resistance to Aqueous Corrosion’
on our website, www.specialmetals.com.

The outstanding attribute of INCOLOY alloy 825 is its high level of corrosion resistance. In both reducing and oxidize
environments, the alloy resists general corrosion, pitting, crevice corrosion, intergranular corrosion, and stress-corrosion
cracking. Some environments in which INCOLOY alloy 825 is particularly useful are sulfuric acid, phosphoric acid, sulfurcontaining
flue gases, sour gas and oil wells, and sea water.
For details on the corrosion resistance of alloy 825, refer to Special Metals publication “Restistance to Aqueous
Corrosion”, on the website, www.specialmetals.com.

另外，inconel系列无825

不懂啊，学习

纯从温度的角度来说肯定是625的比较好点，但不同情况下的选择是不一样的，每个材料的发明都是针对不同情况的，以高代低不是不可以，但镍合金的价值实在很高，所以一般情况下很少会去取代，只是根据实际情况来进行选材。