Browse Prior Art Database

Metallized Ceramic Protective Pin Coating Detection System

IP.com Disclosure Number: IPCOM000061732D
Original Publication Date: 1986-Sep-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Anschel, M: AUTHOR [+2]

Abstract

Copper surfaces are frequently coated with organic oxidation inhibitors to prevent their oxidizing/tarnishing during storage. This coating is typically with benzotriazole (BTA) which combines with the copper to form a copper-triazole complex. It is this complex at the copper surface that prevents oxygen from reaching the copper to form copper oxide. The complex has a thickness varying from monomolecular to several hundred angstroms. Because the coating is clear and cannot ordinarily be seen, for those situations where it is desirable to determine if coating is present, a quick and facile detection method is provided in the following. Mix a 0.67 molar p-dimethylaminobenzaldehyde (P-DMABA) solution in xylene and store in a light-proof container.

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Metallized Ceramic Protective Pin Coating Detection System

Copper surfaces are frequently coated with organic oxidation inhibitors to prevent their oxidizing/tarnishing during storage. This coating is typically with benzotriazole (BTA) which combines with the copper to form a copper-triazole complex. It is this complex at the copper surface that prevents oxygen from reaching the copper to form copper oxide. The complex has a thickness varying from monomolecular to several hundred angstroms. Because the coating is clear and cannot ordinarily be seen, for those situations where it is desirable to determine if coating is present, a quick and facile detection method is provided in the following. Mix a 0.67 molar p-dimethylaminobenzaldehyde (P-DMABA) solution in xylene and store in a light-proof container. Wash the coated copper in a small quantity of 10% (by volume) hydrochloric acid (HCl). The test sensitivity is increased by maintaining or limiting the amount of HCl. Add several grains of zinc metal to the copper wash solution and heat gently, 3 - 4 minutes. Place three drops of the 0.67 molar P-DMABA solution on filter paper which serves as the medium to contact the surface to be tested for BTA. The appearance of a bright yellow color on the filter paper indicates the presence of a BTA coating. The absence of BTA is established if the filter paper remains colorless. The reaction pathways are seen in Fig. 1 and Fig. 2.

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