Accession Number : ADA295042

Title :   An Investigation of the Chemistry of Citric Acid in Military Soldering Applications.

Corporate Author : NAVAL AIR WARFARE CENTER WEAPONS DIV CHINA LAKE CA

Personal Author(s) : Nissan, Robin ; Merwin, Larry ; Fischer, John ; Smith, Jim ; Maurice, Jerry

PDF Url : ADA295042

Report Date : JUN 1995

Pagination or Media Count : 32

Abstract : As a result of the phase-out of ozone-depleting chemicals (ODC), the military and its contractors are facing the problem of developing alternative materials and processes which currently employ these materials. Electronics are a particularly challenging problem because efficient removal of post soldering flux residues is critical to the long-term performance of high reliability electronics. The use of water soluble flux offers an attractive option because all cleaning would be accomplished using only water. Until recently, the military has not allowed this type of flux because of the highly corrosive fluxing action usually associated with these materials. However, a new flux ingredient, citric acid, is gaining favor within the electronics manufacturing industry. Citric acid offers excellent fluxing ability, efficient removal of residues with water, and non-ionic flux formulations. This report examines the chemistry of this material under simulated soldering conditions in an effort to gain an improved understanding of thermal reactions and degradation products which may have an effect on long-term reliability of military electronic hardware. jg

Descriptors :   *CITRIC ACID, *MILITARY APPLICATIONS, *SOLDERING FLUXES, THERMAL PROPERTIES, SIMULATION, DEPLETION, ELECTRONICS, REMOVAL, MANUFACTURING, DEGRADATION, CHEMICALS, WATER, COMPOSITE MATERIALS, ELECTRONIC EQUIPMENT, EFFICIENCY, CLEANING, SOLUBILITY, OZONE, RELIABILITY(ELECTRONICS), RESIDUES, HIGH RELIABILITY.

Subject Categories : Organic Chemistry
      Inorganic Chemistry
      Mfg & Industrial Eng & Control of Product Sys
      Logistics, Military Facilities and Supplies

Distribution Statement : APPROVED FOR PUBLIC RELEASE