Sulphide Stress Cracking (SSC) The second part of a multi-part series For SCC see Part 1 Tonsai/Railay is where stainless-steel anchors go to die. We can now add, that the cause is SRB-mediated SSC. Introduction: I owe much to Martin Roberts of Titan Climbing for taking the initial steps of our great adventure into crag chemistry. […]
Is there a problem with severe bolt corrosion on Kalymnos… yeah?… nah? Let’s review what we know. Many thanks to Jorge Jordan for sending me the broken bolt, and thanks also to Emanuele Pellizzari for the wall-wash samples. Introduction: In September of last year, Facebook lit up with a report of a bolt failure at […]
Occasionally we see evidence for the diffusional path of hydrogen. Many thanks to Luis Fernandes Silva for the photos and sample. I was skimming through some photos that Luis sent me a few years ago when one in particular, from Sesimbra del Drento, caught my eye. This crag is a high-sulphate, sea cliff where the […]
Origin of Sulphur The sixth part of a multi-part series Introduction: It has been my observation that, almost without exception, highly corrosive sea cliffs are associated with very high levels of sulphate, either coating the rock surface, or oozing from the groundwater. Further to this fact is the observation that, in almost all cases, an […]
Sulphide Stress Cracking The second part of a multi-part series In conducting this work I have been greatly assisted by Luis Fernandes Silva and Rui Rosado who have provided multiple samples and photos for analysis. Luis has spent a great deal of time measuring spot-sulphate levels, and the pH profiles of bolts he has extracted […]
The story of a sulphate crag The first part of a multi-part part series In conducting this work I have been greatly assisted by Luis Fernandes Silva and Rui Rosado who have provided multiple samples and photos for analysis. Luis has spent a great deal of time measuring spot-sulphate levels, and the pH profiles of […]