Ni based alloy intergranular corrosion C method
Tianjin Rong Da Testing Co., Ltd. contact: Wang Jingfu
Cell phone: 13102238283 QQ:3144667033
Telephone: 022-23892103
Ni based alloy intergranular corrosion A method --- sulfuric acid ferric sulfate 120h
Ni based alloy intergranular corrosion B method --- copper - copper sulfate - sulfuric acid 24h or 72h
Ni based alloy intergranular corrosion C method --- hydrochloric acid method 168h
Ni based alloy intergranular corrosion D method --- nitric acid method 5 * 48H
Standard: 15260-1994 GB/T
Sample requirement: sample surface area 20-35cm2
Intergranular corrosion: the basic practice is to first in the acid solution of intergranular corrosion (or cooking) a certain amount of time, and then carry out the test. GB/T4334-2008 contains a variety of methods, a screening method, also have test; in addition, different types of stainless steel with different methods, such as sulfuric acid copper sulfate by bending method, nitric acid hydrofluoric acid by the method of weighing method; in addition, according to the representative parts are after thermal process in acid solution before sensitization in this type of stainless steel processing, is most easily temperature intergranular corrosion occurs for a certain period of time, in order to verify the intergranular corrosion resistance of stainless steel. Specific criteria can be checked, refer to a number of stainless steel manual.
Intergranular corrosion test meaning is of metallographic polished sample heat corrosion or electrolytic etching in specific acid solution, then intergranular corrosion and intergranular cracks in the reticular tissue under the microscope and evaluated, and the bending test (90 degrees), surface state, such as gloss, hairline traces and cracks and evaluation.
Concrete implementation standard:
A262 ASTM
GB/T4334
ISO3651 and other test standards
But the different proportion of each standard solution, the price is different, there is a great difference in the length of time between the well!
The ratio of solution of sulfuric acid, oxalic acid, hydrofluoric acid, copper sulfate, etc.