"The street finds it's own use for things"
William Gibson in "Burning Chrome"

On 6/8/21 11:44 AM, Joseph Smith wrote:
> In Philly they load HF into paint pens and use it for Graffiti on Glass
> surfaces. They mangled up some very expensive sculptures, glass doors,
> train windows and more with that.
>
> Joe Smith
>
>
>
> On Tue, Jun 8, 2021 at 1:56 PM Yaritza Brinker wrote:
>
>> I‰??m glad to see work happening on this area.
>>
>>
>>
>> HF has been unavoidable in metallography. Particularly with aluminum
>> alloys where practically all standard etchants call for it and it‰??s often
>> used in combination with concentrated HCl and HNO3. Picric is another acid
>> that is hard to avoid in metallography.
>>
>>
>>
>> It would be great to see more safer etchants developed and added to
>> industry test standards so that their use can extend outside of academia
>> where labs are bound by a2La accreditation rules.
>>
>>
>>
>> Keep up the great work!
>>
>>
>>
>> Yaritza Brinker
>>
>> 260.827.5402
>>
>>
>>
>> *From:* ACS Division of Chemical Health and Safety
>> *On Behalf Of *Andy Glode
>> *Sent:* Tuesday, June 8, 2021 9:55 AM
>> *To:* DCHAS-L**At_Symbol_Here**Princeton.EDU
>> *Subject:* [DCHAS-L] alternative etchant for metal samples
>>
>>
>>
>> *** External Email ***
>>
>> Hi all,
>>
>>
>>
>> I am late in sharing a significant innovation one of our students, Nick
>> Ferreri, made last year that will be of interest to this group. I presented
>> safety training to a group students who were planning to use HF as an
>> etchant. Nick took it upon himself to research alternatives to HF and
>> developed a method that eliminated HF use from his preparation method for
>> titanium samples. The alternative method uses ethylene glycol, ethanol,
>> sodium chloride, and a low voltage charge. Please note that concentrated
>> acids and high voltage are not used in this etch method, completely
>> avoiding the major hazards historically associated with titanium metal
>> preparation for electron microscopy. And, the resulting etch is better than
>> if the sample had been etched with HF. Please share this with colleagues
>> who may use HF to etch titanium and titanium alloys.
>>
>>
>>
>> The published article describing the method is here:
>>
>> https://www.sciencedirect.com/science/article/pii/S1044580320303363
>> <https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.sciencedirect.com%2Fscience%2Farticle%2Fpii%2FS1044580320303363&data=04%7C01%7C%7C3f4806d3b7f54460c1ca08d92a856621%7C994c3e8bb42845fb8640593ef0303f7f%7C0%7C1%7C637587574694306216%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&sdata=g6YLmENP0RCu3ZekyRsIHVdURuwRYzjh6j0oXGSJpcc%3D&reserved=0>
>>
>>
>>
>> Thanks!
>>
>> Andy
>>
>>
>>
>> Andy Glode, MS, CIH
>>
>> Interim Director
>>
>> Office of Environmental Health and Safety
>>
>> University of New Hampshire
>>
>> O: 603-862-5038; C: 603-534-9872
>>
>> https://www.unh.edu/research/environmental-health-and-safety
>> <https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.unh.edu%2Fresearch%2Fenvironmental-health-and-safety&data=04%7C01%7C%7C3f4806d3b7f54460c1ca08d92a856621%7C994c3e8bb42845fb8640593ef0303f7f%7C0%7C1%7C637587574694306216%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&sdata=swVZ%2FqXfhwcmjvF9p2UtTPSl4QrEgQcegBIoBlENXHA%3D&reserved=0>
>>
>>
>>
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