Method for detecting phosphorus segregates in metallic material

Details Method for detecting phosphorus segregates in metallic material Method for detecting phosphorus segregates in metallic material

1985-08-13

1987-07-21

Lacey, David L.

Chemistry: analytical and immunological testing

Metal or metal containing

Presence of a component of steel

436103, 436169, 436175, 422 56, G01N 3320

Patent

active

046818570

ABSTRACT:
An aqueous solution containing 0.00005 to 0.2 mol/l of copper ion and 0.0001 to 1.0 mol/l of nitrate ion is effective to detect phosphorus segregates in a metallic material, particularly cast steel. Segregated phosphorus can be detected by etching a surface of steel to be tested, attaching test paper onto the steel surface, applying the aqueous solution to the paper, maintaining the paper in contact with the steel surface until stains appear, and removing the paper from the steel surface. A red print is obtained when the solution is pH 6 or higher. A blue print is obtained by following the above steps, and further treating the paper with a color reagent containing molybdate ion, and then with a reducing agent.

REFERENCES:
patent: 1994499 (1935-03-01), Boller
patent: 3758351 (1973-09-01), Striedieck et al.
patent: 3796543 (1974-03-01), Kamphake
patent: 4080246 (1978-03-01), Battisti et al.
patent: 4530735 (1985-07-01), Whitehurst et al.
T. S. Harrison, The Determination of Phosphorus in Heamatite Iron and Steel by the Molybdenum Blue Method, J.S.C.I., 68, Mar., 1949, pp. 84-88.
Chemical Abstracts, vol. 26, "New Methods for Identifying Minor Constituents of Alloys and for Detecting Segregation in Metal-Working Materials", Columbus, Ohio, 1932, p. 5871.
Chemical Abstracts, vol. 40, "Colorimetric Determination of Phosphorus in Iron Alloys", Columbus, Ohio, 1946, col. 7065(9), N. D. Ivanova et al.
Chemical Abstracts, vol. 41, "Direct Colorimetric Method for Phosphorus in all Types of Steel", Columbus, Ohio, 1947, col. 6171 d-f, H. L. Katz et al.

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