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This is a very interesting article for those interested in good bolting practice: RI_201403_BoltCorrosionArticle.pdf.
The key take-outs, that aren't very widely recognised among climbers are:
1) Stainless steel is still at risk of pitting corrosion in highly aggressive environments (especially, but not only, marine). This kind of corrosion isn't obvious to the naked eye and can lead to sudden failure.
2) Sun can cause high temps in the steel and this greatly accelerates this pitting corrosion.
3) Expansion bolts are far more susceptible to this problem than glue-ins (principally because there are less "crevices").
As a result of this I have made one change to the way I make U-bolts and that is to grind the notches only where they will be embedded at least 10 mm below the surface. The notches are a weak-point for corrosion so having them well-covered is important.
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