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

1984-11-13

1987-02-17

Lacey, David L.

Chemistry: analytical and immunological testing

Metal or metal containing

Presence of a component of steel

436103, 436169, 436175, G01N 3320

Patent

active

046439781

ABSTRACT:
An aqueous solution of silver nitrate 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 an aqueous solution of 0.1 to 80% by weight of silver nitrate to the paper, maintaining the paper in contact with the steel surface for a sufficient time, removing the paper from the steel surface, and subjecting the paper to fixing treatment.

REFERENCES:
patent: 3796543 (1974-03-01), Kamphake
patent: 4420567 (1983-12-01), McMahon et al.
Chemical Abstracts, vol. 26, 1932, p. 5871, Columbus, Ohio, US; M. Niessner: "New Methods for Identifying Minor Constituents of Alloys and for Detecting Segregation in Metal-Working Materials", Mikrochemie, 12, 1-24 (1932).
Chemical Abstracts, vol. 41, 1947, col. 6171 d-f, Columbus, Ohio, US, H. L. Katz et al.: "Direct Colorimetric Method for Phosphorus in All Types of Steel", Anal. Chem., 19, 612-14 (1947).
Chemical Abstracts, vol. 40, 1946, col. 7065-9, Columbus, Ohio, US; N. D. Ivanova et al: "Colorimetric Determination of Phosphorus in Iron Alloys", Zavodskaya Lab., 12, 146-8 (1946).
T. S. Harrison, The Determination of Phosphorus in Heaematite Iron and Steel by the Molybdenum Blue Method, J.S.CI., 68, Mar. 1949, pp. 84-88.

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