Method and compositions for detecting flaws

专利名称：Method and compositions for detecting

flaws

发明人：SWITZER ROBERT C.申请号：US55316655申请日：19551214公开号：US2953530A公开日：19600920

摘要：795,779. Detecting surface flaws. SWITZER BROS., Inc. Sept. 24, 1956 [Oct. 12,1955], No. 29082/55. Class 106 (2). [Also in Group XL (a)] A testing agent for use indetecting surface flaws in test bodies comprises a dye dispersed in a flaw-penetratingliquid selected from the class consisting of polyoxyalkylene glycols and aliphatic mono-and di-ethers thereof. If the liquid chosen is a water-immiscible one there may be addedto this liquid one or both of the following: (a) a water-immiscible diluent such as ahydrocarbon oil penetrant, for example kerosene, and (b) an oil-soluble emulsifyingagent, such as petroleum sulphonate or any of a wide range of soaps or detergents. Theemulsifier may include a coupling agent which will assist the emulsifying agent in couplinga washing water with the oil constituent of the liquid to form an emulsion which will stripoff the penetrant from the surface being inspected. The coupling agent is preferably aglycol, for example ethylene glycol. If the flow-penetrating liquid chosen is one misciblewith water, water or a water-miscible organic extender may be used as the diluent andthe emulsifying and coupling agents omitted. A water-immiscible penetrant can be usedwithout an emulsifying agent where the emulsifying agent is incorporated in the washwater used for washing the penetrant from the surface of a body coated therewith or

where the emulsifying agent is applied over the penetrant coated body by spraying ordipping before washing the penetrant from the surface of the article. The dye may be anon-fluorescent colour material or one containing a fluorescent dye responsive toultraviolet light. Examples of suitable fluorescent dyes are quoted and the use ofpolyoxyalkylene glycols is stated to enhance the brightness of the fluoragent.Specifications 2,402, [Group XL (a)], 684,021 and U.S.A. Specification 2,259,400 arereferred to.

申请人：SWITZER BROTHERS, INC.

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