1 Scope
This standard specifies the perchloric acid dehydration gravimetric method for the determination of silicon content in iron, steel, high temperature alloy and precious alloy.
This standard is applicable to determination of 0.10% (m/m)~6.00% (m/m) silicon content in iron, steel, high temperature alloy and precious alloy.
2 Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this standard. As all the standards will be revised, each party using this standard shall discuss the feasibility of using the latest edition of the following standards.
GB/T 222-84 Method of Sampling Steel for Determination of Chemical Composition and Permissible Variations for Product Analysis
GB 6379-86 Precision of Test Methods: Determination of Repeatability and Reproducibility for a Standard Test Method by Interlaboratory Tests
3 Method Summary
Dissolve the specimen with hydrochloric acid and nitric acid dissolution, dehydrate silicic acid with perchloric acid smoking, filter and clean the silicic acid and then firing it into silicon dioxide. Handle it with sulfuric acid -hydrofluoric acid, make it produce silicon tetrafluoride which is volatilized and removed. Calculate the silicon contents according to the mass difference after the removal of silicon.
