Corrosion resistant compositions for titanium brazing and coating applications and methods of application

A composition and brazing technology, applied to plates and other heat exchangers, brazed products, and titanium-based equipment, can solve problems such as expensive, low working temperature, and reduced corrosion resistance

Inactive Publication Date: 2015-08-26
佩萨赫塞德尔
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 3- Crevice corrosion can occur at the contact points between adjacent corrugated plates
However, silver based fillers have disadvantages as mentioned above
[0037] Therefore, fillers provided by the prior art which can be used for brazing at temperatures below 890°C, when used as required for brazing titanium and its alloys, have low mechanical strength, low workability compared to the base metal to be brazed. temperature and / or are very expensive and / or have reduced corrosion resistance

Method used

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  • Corrosion resistant compositions for titanium brazing and coating applications and methods of application
  • Corrosion resistant compositions for titanium brazing and coating applications and methods of application
  • Corrosion resistant compositions for titanium brazing and coating applications and methods of application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0116] Three specimens of Grade 2 Ti were prepared for subsequent corrosion testing by brazing two corrugated plates to each other with a filler composition comprising two fillers: Filler #1 (37.5% Ti-37.5% Zr-15%Cu-10%Ni) and filler #2 (78%Ag-9%Pd-9%Ga, which is commercially available as Pallabraze 880Ga). The filler composition contained two fillers in a ratio #l / #2 of 97.8 / 2.2; the filler thus obtained contained 0.2% of Pd.

[0117] The Pd content in the resulting brazed joint was found to be 0.2%. Pd is evenly distributed in the joint. Three specimens of Grade 2 Ti brazed with filler #1 without any additives such as palladium were prepared for control corrosion testing.

[0118] Corrosion tests were performed by immersing the specimens in a 40% LiCl solution for 320 hours (15 days) at a temperature of 120-135° C. and pH 3; the pH was lowered by adding HCl to the solution.

[0119] refer to figure 1 , as shown in the metallographic cross-section of the joint, pitting co...

Embodiment 2

[0122] Three specimens of Ti grade 2 were prepared for corrosion testing by brazing two corrugated plates together with a filler based on Filler #1 (37.5%Ti-37.5%Zr-15%Cu-10% Ni) Filler with 0.2% Pd powder added.

[0123] Referring to the conditions of Example 1 above, the tests of these samples were carried out in 40% LiCl solution.

[0124] refer to image 3 In the photomicrographs of , only very slight corrosion damage was found in the brazing with 0.2% Pd introduced into the filler by dissolving Pd powder in the base filler #1.

Embodiment 3

[0126] Three specimens of Ti grade 2 were prepared for corrosion testing by brazing two corrugated plates together using a filler comprising a mixture of the two fillers, #1 and #2. The content of Pd in ​​the filler is 0.3%. The filler composition and brazing procedure refer to Example 1 above.

[0127] Three other specimens of Ti grade 2 brazed by filler #1 without any further additions were prepared for control corrosion testing.

[0128] At temperature 120°C and pH 3, in 32-35% MgCl 2 Testing of these samples was performed in solution; the pH was lowered by adding HCl to the solution.

[0129] The following table summarizes the test conditions.

[0130] Duration (hours)

temperature(℃)

pH

Solution concentration, %

stage

99

118

～3

31.9

1

99

12

3.5～

35.1

2

102

130

3.5～

35.3

3

98

135-150

3.5～

35.3 or more

4

[0131] The total test duration was 398 hour...

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Abstract

A composition comprising titanium, a small amount of at least one platinum group metal and alloying elements for lowering melting point of the composition to below titanium beta transus temperature.

Description

[0001] Cross References to Related Applications [0002] Priority is claimed to U.S. Provisional Patent Application No. 61 / 703,308, filed September 20, 2012, the contents of which are hereby incorporated by reference in their entirety. Background of the invention [0003] The present invention relates to joining and surface engineering of titanium and its alloys, and to products after brazing, especially titanium-based equipment such as plates and other heat exchangers. [0004] Traditional plate heat exchangers are constructed from multiple corrugated plates that are assembled into a stack and pressed together using two solid carbon steel plates mounted on both sides of the stack and It is connected to the stacking blocks by a large number of connecting bolts or stud bolts. Carbon steel plates may contain fixing plates and pressure plates so that the plates are pressed against the corrugated plates by tightening the bolts. Heat exchange between two fluids of different tempe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/08C22C14/00B23K1/00F28F21/08
CPCB23K1/19B23K35/0244B23K35/325B05D5/00B23K2203/14F28D9/0031B23K1/008B23K35/0222B23K35/322F28F2275/04B23K1/0012F28F21/089B23K2201/14F28F3/042F28F21/086B23K2101/14B23K2103/14
Inventor 佩萨赫·塞德尔奥尔加·博特斯坦约瑟夫·里斯金
Owner 佩萨赫塞德尔
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