Rusty stain on the "Stainless" steel stanchion

[tcm]

Re: Rusty stain on the \"Stainless\" steel stanchion

um, contamination from chromium vandium tools? Sure contamination from mild steel brings carbnon brings rust? But a major constituent of stainless steel is chromium, innit?

 

[DeeGee]

Re: Rusty stain on the \"Stainless\" steel stanchion

Cliff? Any comments on the last two? They sound nice and simple (not sure which French oven cleaner to use, but that's another story), do either of them give the same effect as pickling? The Solvol solution, if it works for one season only, sounds like putting a layer of something on top as protection, but the pickling actually creates an oxide layer on the surface, n'est ce pas?

 

[starboard]

Re: Rusty stain on the \"Stainless\" steel stanchion

Just ask Ciff to pop over and look at my Stainless!! he will be impressed. The Solvol is a paste that has been on the mrket for 40 years. As a young nipper i used to use it on my alloy handlebars to make them shine like chrome. I promise once you have used it you will use nothing else again.......if its good enough for the super yachts in Monaco its good enough for me!!!!!

Paul.

 

[cliff]

Re: Rusty stain on the \"Stainless\" steel stanchion

Yes! Ordinary Cr-V tools contain lowish levels of Cr - not sufficient to give "stainless effect" - scratch the chrome plating off and see how fast they rust.
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"Artificial intelligence is no match for natural stupidity"

 

[cliff]

Re: Rusty stain on the \"Stainless\" steel stanchion

I dare say both will remove the rust marks but I am talking of removing the cause of the rust marks. A bit like treating some one with pain killers rather than treating the cause of the pain.

The "Astonish" I believe is caustic so I would not use it near my S/S. As for the SolVol - don't know - I'll have to have a look at Paul's boat next time I am down.

Pickling removes the free iron from the surface and the passivating chemically rebuilds the protective chromium oxide layer although there is still some uncertainty as to the exact mechanism of the protection. Some aspects of Metallurgy are still in the realms of "alchemy" - it is not an exact science - there are still some grey areas where the erudite authorities choose to differ.
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"Artificial intelligence is no match for natural stupidity"

 

[starboard]

Re: Rusty stain on the \"Stainless\" steel stanchion

Cliff...seeing its you mate I will pop over and clean a stanchion with "Solvol" for you, then no matter how much Guiness or puke you put on it I think you will be impressed with the result........the only problem will be "Stravaigen" will want the same treatment too!!!

Paul.

 

[cliff]

Re: Rusty stain on the \"Stainless\" steel stanchion

Haven't puked on my stanchions for yonks although I dare say Simon would want his SS polished although our local "russian trawler" has so much S/S framing on the stern it could take you all winter to clean it.
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"Artificial intelligence is no match for natural stupidity"

 

[Birdseye]

Re: Rusty stain on the \"Stainless\" steel stanchion

I used to sell stainless steel wire to the fastener manufacturers both here and abroad - we were the worlds biggest producer in those days. Much of it was copper coated to avoid welding to the dies in head forming, and the threads were then roll formed. The copper was removed after that process so there would be no risk of contamination from the forming tools. What wasnt copper coated was coated with a mixture of stearate and moly disulphide with the same result. So I suspect the rust from 304 bolts was more to do with oxygen starvation is use that anything else, and whilst passivating might well thicken the surface coat, it wont get round that problem completely.

You're right about the heating I did. Our normal annealing temp for austenitic was in the 1050 to 1100 range and try as I may with a blowlamp I didnt get it near. So all I did was sensitise. But before treatment as hard rolled it must have been up at the 60/70 tonne tensile range and was impossible to drill with hand held domestic kit. All that happened was drills skating across the surface and breaking / bluntening.