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All parts made from 304 SS end up with the same corrosion resistance – right?

It’s not just the material you use, but critically, it matters how you use it. I have been researching the possibility that the brittle fractures we are seeing at Cabo da Roca and Sesimbra in Portugal are hydrogen embrittlement (HE) fractures mediated via the presence of sulphate reducing bacteria (SRB). Austenitic stainless steels like 304 […]

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Never Say Never

The benign cliffs of Campo Escola da Barra da Lagoa I reported wall-wash results from this low-corrosion crag some time ago. The sulphate levels were not elevated, a fact which supports my mantra “no sulphate – no corrosion”. However, it always interesting to take a somewhat deeper look, which I was able to do thanks […]

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Laboratory Lock-down

This note was posted to the Titanium Bolting FB Group 1st April 2020 Being locked down is not so bad if you can keep working in your lab. I’ve finally caught up with some wall-wash samples sent to me by Rodrigo Castelan Carlson from the beautiful granite slab sea cliffs of Campo Escola da Barra […]

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More Evidence for the Agency of SRB

This note was posted to the Titanium Bolting FB Group 10th March 2020 Warning: This gets a bit geekey, but I’ll simplify as much as possible. For the past few years I have concentrated on providing sufficient evidence for the theory that all marine crags showing SCC of 304SS are associated with high sulphate levels. […]

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A Certain Ring of Truth

This note was posted to the Titanium Bolting FB Group 7 March 2020 Everyone knows and loves those huge lower-off rings we find at the top of climbs at Railay/Tonsai.However, some of us began to love them a whole lot less when it became clear that they too were subject to the dreaded SCC. If […]

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Corrosion Observations for Heuco Wall

This note was posted to the Titanium Bolting FB Group 29 January 2020 The hero of this piece is Martin Roberts who burnt countless hours of quality time, when he could have been climbing, installing a large range of anchor types in a whole pile of locations across Railay/Tonsai. My motto is to “measure more and […]

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Distance from the Sea ….Extra

This note was posted to the Titanium Bolting FB Group 27 January 2020 I promise this is the last “distance from the sea” post ….. for a little while at any rate I say extra, because here I’m talking about Heuco Wall (just 50m beyond Low Tide Wall), and this is one of a number […]

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Another Distance From Sea Investigation

This note was posted to the Titanium Bolting FB Group 21 January 2020 Bit of a back story here…. When I first visited Railay, some 12 years ago, I had heard stories about perfectly good-looking SS bolts snapping under body-weight, but being ever the scientific skeptic, I thought I’ll believe that when I see it […]

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More data on the effect of distance from the sea

This note was posted to the Titanium Bolting FB Group 16 January 2020 Today I measured spot sulphates at three points on the set of cliffs containing Diamond Cave, ending with a sample from Diamond Cave North climbing area itself. All showed zero levels as I would expect for a crag 300m from the sea. […]

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Not all white deposits are calcium sulphate

This note was posted to the Titanium Bolting FB Group 16 January 2020 A consistent feature of the “sulphur crag” story, especially at Railay/Tonsai is that sulphate is not found any distance more than 100m or so from the sea. Thus it is no surprise that the white deposit found at Wee’s Present Wall shown […]