A soldering flux consisting of perfluoro-octanoic acid hydrazine provides a corrosion resistant film on metal surface, particularly copper. It is ineffective for soldering aluminum

Bauman, A. J.

English

NASA Technical Reports Server

October 1964	 Brief 64-10206 
NASA TECH BRIEF	
a 
This NASA Tech Brief is issued by the Technology Utilization Division to acquaint 
industry with the technical content of an innovation derived from the space program. 
Solder Flux Leaves Corrosion—Resistant Coating on Metal 
The problem: Formulating a soldering flux that 
leaves a corrosion-resistant coating on the metal sur-
faces surrounding the soldered part. 
The solution: A soldering flux consisting of per-
fluoro octanoic acid hydrazide. 
How it's done: The hydrazide is formed by adding 
hydrazine to an aqueous solution of perfluoro 
octanoic acid until a pH of 7 is indicated by methyl 
red. The hydrazide, which has the appearance of a 
white wax, is recovered from the reaction mixture 
by evaporation of the water. 
The resultant wax-like material serves as an effective 
flux for lead/tin (60/40) solder on copper. After 
soldering is completed, the perfluoro octanoic acid 
liberated on the metal is washed off with water. The 
unreacted hydrazide remains as a tightly adhering film 
and protects the underlying metal surface against 
common corrosive agents.
Notes: 
1. The hydrazide film was found to protect a copper 
surface from attack by 6 normal hydrochloric acid. 
2. The flux is ineffective for soldering of aluminum. 
3. Inquir ies concerning this invention may be directed 
to:
Technology Utilization Officer 
Jet Propulsion Laboratory 
4800 Oak Grove Drive 
Pasadena, California, 91103 
Reference: B64-10206 
Patent status: NASA encourages the immediate 
commercial use of this invention. Inquiries about 
obtaining rights for its commercial use may be made 
to NASA Headquarters, Washington, D.C., 20546. 
Source: A. J. Bauman 
(JPL-61 1) 
This document was prepared under the sponsorship of the National 
Aeronautics and Space Administration. Neither the United States Govern- 
ment, nor NASA, nor any person acting on behalf of NASA: A. Makes 
any warranty or representation, express or implied, with respect to the 
accuracy, completeness, or usefulness of the information contained in
this document, or that the use of any information, apparatus, method, 
or process disclosed in this document may not infringe privately-owned 
rights; or B. Assumes any liabilities with respect to the use of, or for 
damages resulting from the use of, any information, apparatus, method, 
or process disclosed in this document.
https://ntrs.nasa.gov/search.jsp?R=19640000060 2020-03-11T17:04:32+00:00Z


Solder flux leaves corrosion-resistant coating on metal

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