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Q&As since 1989
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Nitinol pickling, descaling, etching process
Q. After having shaped a Nitinol strip at 500-600 °C, I need to remove the oxide layer generated during the heat treatment, and have a shiny surface. The selected process is etching. I am looking for the chemical composition of the etching media.
Hani rauch- Ceasarea, Israel
2005
A. The chemical thinning process of the TiNi alloy is tested using two methods: the chemical etching with the assistance of ultrasonic agitation, and the electropolishing. There are two chemical solutions, Solutions A and B, for chemical etching. Both of them consist of the solutions of HF, HNO3 and H2O with different volume ratios, in which Solution A is HF : HNO3 : H2O ratio 1 : 4 : 5, and Solution B is 1 : 5 : 20.
For the electropolishing process, the electrolyte is composed of H2SO4 and CH3OH with 1 : 4 in volume ratio. The applied voltage is 5 V and the operation temperature is 208 C.
Source: Materials, Chemistry and Physics, 58 (1999) 162-165
- Turkey
2005
Q. When you use the solution of HF:HNO3:H2O in the two different proportions, what happens to the NiTi Surface?
Saskia Castrostudent - SLP, Mexico
January 15, 2009
Sulphamic Acid Management for Nickel-Titanium pickling and descaling
Q. Hi
I'm performing a couple of tests on Nickel Titanium to remove the oxide layer after heat treating it in a salt bath. I've been using a mixture of sulfamic acid [on
eBay or
Amazon], Hydrogen Peroxide, and water and then heating the solution with the Nickel Titanium and just mixing it while it removes the oxide layer. I've been having trouble with guaranteeing I can't use the solution anymore and was also wondering if there is any way I can save some of my money and somehow do something to reuse the solution.
Is there also a way to rejuvenate the sulphamic acid so I can use it for longer?
Bilin Loi
Student - Madison, Wisconsin
September 13, 2017
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