Dr Keith Walker @SteelFolk@social.cleverlibre.org
Steel industry metallurgical specialist.
Joined Nov 2022
@johnabs @freemo You'll remember that there are nearly always layers of different oxides due the differing oxygen activities. It's also affected by iron activity too if it interacts with alloy elements, so pure iron rusts like like hell, which was why car bodies did at door bottoms when they were made with 'rimming' steel aimed at superior surface quality.
@johnabs @freemo Gents - you can form an a thin layer of magnetite by heating or by electro-chemical means and it has the blue colour. due to interference. The relevant bit is that it is a barrier to oxygen diffusion so the underlying metal doesn't oxidise any further in air. Oxides on aluminium and stainless ( Cr oxide) act in the same way without needing any intervention ("self-passivation") but not on iron, which forms increasing amounts of (hydrated) oxides ("rust") if left alone.
@sciencebase There was a Deb Tilly on that trip but she wasn't attracted to my lamp, just nicked my tabs.
Dr Keith Walker
boosted
“Marine extinctions and their drivers”
#ocean #biodiversity
"We recorded local extinctions for 717 species, of which 18 were global extinctions. Most of these extinctions were recorded on very localized and sub-ecoregion scales. The taxonomic group with the most reported local extinctions was molluscs (31%), followed by cnidarians (22%), fish (17%) and macroalgae (15%).”
https://link.springer.com/article/10.1007/s10113-023-02081-8#citeas
@sciencebase They were once made with Thorium Dioxide but slip cast TiO2 (rutile) now.
Dr Keith Walker
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Dr Keith Walker
boosted
“Every heat-related death is preventable.”
In-depth: How climate change affects health in Africa - Carbon Brief
https://www.carbonbrief.org/in-depth-how-climate-change-affects-health-in-africa/
Dr Keith Walker
boosted
On this note, the request of avoiding the spread of links about climate conspiracies because, as for any conspiracy, they radicalise people and pose a serious threat for some:
https://www.washingtonpost.com/nation/2023/06/22/meteorologist-climate-death-threat-iowa/
Acknowledging climate conspiracies is an important job for every movement, but we always need to be cautious of doing properly, without facilitating access to disinformation, bc we can all fall prey to it.
Dr Keith Walker
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Happy #solstice
This photo was a 6 month exposure from my back yard, It shows the tracks of sunlight from one solstice to the next.
@sciencebase No, those little Al containers. Blue things with butane in them. My lamp had a mantle too!
@sciencebase They're partial to camping gas lamps but often get killed. I once had a dead Swallowtail, a sad do. That was at Trumpington actually, right on the riverside.
@sciencebase Isn't a wemlite the sort that goes in a fly killer? I thought those excluded moths somehow.
Dr Keith Walker
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I'm laughing at memes about billionaires who can't pull themselves up to the surface by their own bootstraps, but in reality I'm furious.
I'm furious I was accused of human smuggling by FRONTEX (European border agency) for being part of a sea rescue operation that saved 1000+ lives of refugees fleeing war & terrorism.
I'm furious at the money and international effort being spent to rescue these billionaires when operations like ours cost so little and save so many lives, but are punished.
Dr Keith Walker
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Read our @CCSI_Columbia recommendations on how countries governments, international actors, & #mining advocates should heed caution when pursuing and promoting the mining of #CriticalMinerals:
https://ccsi.columbia.edu/content/dont-throw-caution-wind-green-energy-transition-not-all-critical-minerals-will-be-goldmines
@Frances_Coppola When I was little and got my first mortgage, Mrs Thatcher came on the telly and explained that high interest rates were good for savers and my Gran nodded cos she always said I was bad for borrowing such a huge amount. So I opened a TSB account with £10 and now I've got £12.70 in it.
Dr Keith Walker
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In the light of today's #inflation figures and calls for measures to relieve the pain of high mortgage interest rates, my piece on inflation, loss and grief suddenly seems awfully timely. https://coppolacomment.substack.com/p/inflation-and-grief
Dr Keith Walker
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"Everywhere is hiring" ok but are they offering a living wage? Are the working conditions safe? Do you help with childcare? What about scheduling? Do you refuse to schedule more than 30 hours a week to dodge paying benefits but demand 24/7 availability so they can't get a second job?
@davidallengreen Confident forecast, David!
Dr Keith Walker
boosted
Ok here’s the true test of whether the fedi can replace Reddit. Can anyone help me identify this antique singer sewing machine?
I’m pretty good at recognizing all the most common models, but a friend found this in his in-law’s house and it has me stumped.
Boosts appreciated
#sewing @sewing #antique #antiqueSewingMachine #vintageSewingMachine
Steel industry metallurgical specialist.
Joined Nov 2022
