wet chemical analysis method
Wet chemical analysis method is a chemical analysis test used for metal testing in liquid state. It is also called Wet chemistry test. Wet chemical test is advantageous compare the Spectro Analysis as, small samples can also be checked that is not possible to test with standard PMI test and does not require any surface preparation for the test.
Wet Chemistry test uses different practices (such as Colorimetric analysis, Gravimetry and titrimetric). In Colorimetry wet chemical test, the transformation in color throughout the test aid to recognize different elements. Based on the absorbance/ transmittance of light by different elements. It works on the principle that if a solute existing in the fluid absorbs light of a definite wavelength than the absorbance is directly proportionate to the element concentration in the liquid. By measuring this light absorbance will deliver the concentration percentage when compared to a standard with the same element of a identified concentration level.
In titration process, a titrant is added with the assistance of burette to the sample till an endpoint is attained. This point is characterized with a change in color. In computerized or latest titration method, physical procedure is substituted with automatic titration where potentiometric arrangement is used to spot the titration endpoint.
Wet chemical analysis procedure
1. Prepare the material in any right method such as chip by drilling or machining/ metal dust or metal shots. The material shall be free from any impurities.
2. Decompose the sample with a chemical such as acid that dissolves in a solvent.
3. Identifies and calculates the target specimen using different approaches such as Colorimetry, Gravimetry and titrimetric for the analysis of numerous elements or compounds of ferrous & non-ferrous metals.
What type of sample can be tested
With wet chemical analysis ferrous and non-ferrous metal can be checked. The material usually taken in the following form:
- Chip (Unburnt stage if taken by drilling/ machining).
- Steel shots.
- Metal powder.
Standard & Specification for wet chemistry Test
ASTM A751-21: Standard Test Methods and Practices for Chemical Analysis of Steel Products