Document Detail

Effect of corrosion on the strength of soldered titanium and Ti-6Al-4V alloy.
MedLine Citation:
PMID:  9002859     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: Finding an optimal soldering system for a titanium prosthesis has become increasingly important with the successful introduction of titanium and titanium alloys to dentistry. This study examined the effect of corrosion on the strength of the soldered joints of pure titanium and Ti-6Al-4V alloys joined using various solders. METHODS: Commercially pure titanium and Ti-6Al-4V alloy rods (2 mm in diameter; 25 mm long) were soldered in an argon atmosphere using four solders: two kinds of titanium-based solder, a gold-based solder, and a silver-based solder. Tensile strengths were examined before or after immersion treatments. Specimens were immersed in either a 0.9% NaCl or 1.0% lactic acid solution held at 35 degrees C for 3 and 8 wk. The amounts of various metal elements released were determined by atomic absorption photospectroscopy. The natural potentials and potentiodynamic polarization behavior of the soldered specimens in 0.9% NaCl or 1.0% lactic acid were determined by a computer-assisted corrosion measurement system. The results were analyzed by ANOVA and Student's t-test. RESULTS: The cp-titanium and Ti-6Al-4V samples soldered with titanium-based solders exhibited tensile strengths of 300-400 MPa and were not significantly affected by immersion in either solution (no significant difference at p < 0.05). The strengths of both the cp-titanium and titanium alloy specimens soldered with gold-based solder were significantly lower than for any of the other specimens and were affected by immersion in the 0.9% NaCl solution (p < 0.01). The cp-titanium and Ti-6Al-4V specimens that were soldered with titanium-based solders did not show any transpassive regions or breakdown in the natural electrode potential range. On the contrary, the specimens soldered with gold-based and silver-based solders showed transpassive regions or breakdown potentials at less than 0 mV in 0.9% NaCl solution. SIGNIFICANCE: It is recommended that titanium-based solder be employed for titanium and titanium alloys.
Y Oda; T Okabe
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Dental materials : official publication of the Academy of Dental Materials     Volume:  12     ISSN:  0109-5641     ISO Abbreviation:  Dent Mater     Publication Date:  1996 May 
Date Detail:
Created Date:  1997-02-04     Completed Date:  1997-02-04     Revised Date:  2000-12-18    
Medline Journal Info:
Nlm Unique ID:  8508040     Medline TA:  Dent Mater     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  167-72     Citation Subset:  D    
Department of Dental Materials Science, Tokyo Dental College, Chiba, Japan.
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MeSH Terms
Dental Alloys / chemistry*
Dental Soldering / methods*
Materials Testing
Tensile Strength
Titanium / chemistry*
Reg. No./Substance:
0/Dental Alloys; 12743-70-3/titanium alloy (TiAl6V4); 7440-22-4/Silver; 7440-32-6/Titanium; 7440-57-5/Gold

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