Blackening Stainless Steel 300 and 400 series and 17-4

Описание: Disclaimer:
I am not encouraging or advising anyone to recreate or attempt these experiments. They involve dangerous chemicals that can be hazardous to your health if not properly handled. This is not a tutorial. This is for entertainment and informational purposes only.

I do some experiements on different grades of stainless steel to see how well I can turn them black.

00:00 Introduction
00:46 Video contents
01:59 Scope and context of experiments
02:39 Iron-carbon material system
06:12 Materials introduced & compared, 300 series
07:42 Intro to 400 series
08:34 Intro to 17-4PH
09:34 Chemicals used
10:37 Stainless steel corrosion resistance, what happens at surface
11:35 How the chemicals work (I think)
11:56 Use of hydrochloric acid
12:29 Blackening chemical SDS and active ingredients
12:51 Material preparation and procedure, experiments
14:13 Testing 303
16:46 Testing 304
19:00 Testing 316
20:28 Testing 416 heat treated
21:32 Testing 17-4PH
22:42 Testing cold blue on 303 and 416
23:25 Testing sealant
24:32 Results and conclusion

Supplementary information sources:
https://www.phase-trans.msm.cam.ac.uk...

https://www.ambicasteels.com/blog/300...

https://www.aatprod.com/ferritic-vs-m...

https://www.techsteel.net/alloy/stain...

https://en.wikipedia.org/wiki/Stainle...

https://en.wikipedia.org/wiki/Martensite

https://en.wikipedia.org/wiki/Austenite

https://en.wikipedia.org/wiki/Precipi...

https://en.wikipedia.org/wiki/17-4_st...

https://www.worldstainless.org/Files/...

Diagram and picture sources:
https://fractory.com/iron-carbon-phas...

https://www.phase-trans.msm.cam.ac.uk...

https://chem.libretexts.org/Courses/U...

https://chemed.chem.purdue.edu/genche....

https://en.wikipedia.org/wiki/Grain_b...