my penknife is stuck closed!
my penknife is stuck closed!
While mowing the lawn at the weekend I found a penknife i had lost last year! It has been outside since October! It's stainless steel so there was me thinking a bit of oil and i will have a handy spare pen knife.
no.
It has some white "corrosion" all over it that is a bit like lime scale (in look and feel) I have forced all the blades open and tried moving it around but it's really stiff.
Does anybody know what happens to stainless steel when left outside for 6 months and if it is possible to reverse it?
no.
It has some white "corrosion" all over it that is a bit like lime scale (in look and feel) I have forced all the blades open and tried moving it around but it's really stiff.
Does anybody know what happens to stainless steel when left outside for 6 months and if it is possible to reverse it?
Understeer: when you hit the wall with the front of the car.
Oversteer: when you hit the wall with the back of the car.
Horsepower: how fast you hit the wall.
Torque: how far you take the wall with you.
Oversteer: when you hit the wall with the back of the car.
Horsepower: how fast you hit the wall.
Torque: how far you take the wall with you.
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Re: my penknife is stuck closed!
Some stainless steel will "Rust" but it doesn't flake like non stainless steels. The higher the chrome content, the more resistent it will be to rust. I would have thought a bit of steel wool would bring it up. Shimano Chain & Cable Lube (See http://cycle.shimano-eu.com/publish/con ... kshop.html) is an excellent penetrating lubricant.
Rules exist for the obedience of fools and the guidance of wise men.
MG Midget 1500, MGB GT V8, Morris Minor Traveller 1275, MG Midget 1275 & too many bicycles.
MG Midget 1500, MGB GT V8, Morris Minor Traveller 1275, MG Midget 1275 & too many bicycles.
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Re: my penknife is stuck closed!
Lucky you found it, and not the mower blades!
These pages might be useful...
http://www.allstainlessltd.co.uk/info/u ... ess_2.html
http://www.corrosionist.com/cleaning_st ... _steel.htm
I'm no metallurgist, but guess the deposits could be galvanic corrosion due to the knife being in contact with the soil itself, or possibly from the spring or pin in the knife being a dissimilar metal.
Best to avoid steel wool on stainless as it does tend to embed itself in the stainless and then rust (cleaned an old sink this way a few years back and it was never the same again )
Hope that helps.
These pages might be useful...
http://www.allstainlessltd.co.uk/info/u ... ess_2.html
http://www.corrosionist.com/cleaning_st ... _steel.htm
I'm no metallurgist, but guess the deposits could be galvanic corrosion due to the knife being in contact with the soil itself, or possibly from the spring or pin in the knife being a dissimilar metal.
Best to avoid steel wool on stainless as it does tend to embed itself in the stainless and then rust (cleaned an old sink this way a few years back and it was never the same again )
Hope that helps.
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http://www.flickr.com/photos/darren-cambs/collections/
1973 Triumph TR6 CR
1971 VW Type 2 Bay Window
1997 Mazda MX5 Mk1
1998 Jeep Grand Cherokee 4.0 Ltd
2001 Alfa Romeo 156 1.6TS Veloce
- Martin Evans
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Re: my penknife is stuck closed!
I've cleaned stainless with steel wool, with no ill effects. I imagine the stainless, in the knife blade, would be harder than that used in a sink and also more highly polished.
Rules exist for the obedience of fools and the guidance of wise men.
MG Midget 1500, MGB GT V8, Morris Minor Traveller 1275, MG Midget 1275 & too many bicycles.
MG Midget 1500, MGB GT V8, Morris Minor Traveller 1275, MG Midget 1275 & too many bicycles.
Re: my penknife is stuck closed!
They could, however they could also be caused by caustic erosion if, when cleaned up, they leave small pitted areas behind. That assumes that the soil is alkaline in its nature though.darrencambs wrote:the deposits could be galvanic corrosion due to the knife being in contact with the soil itself
Once [the knife] has been opened, use a little graphite powder to keep it nice and free. Rubbing a soft (2B or similar) pencil on the hinge area should do the job.
Next: "My boomerang won't come back?"
J
"Home is where you park it", so the saying goes. That may yet come true..
"Home is where you park it", so the saying goes. That may yet come true..
Re: my penknife is stuck closed!
I have NEVER been able to make a boomerang come back. i'm sure the ozzies cheat and use elastic!JPB wrote:"My boomerang won't come back?"
I left the knife in the garage so i'll have a go at it on Saturday and see if i can persuade it to move freely. The soil is heavy clay, no idea if it is acidic or alcali, the only thing i grow in the garden is grass. I have brown fingers!
Understeer: when you hit the wall with the front of the car.
Oversteer: when you hit the wall with the back of the car.
Horsepower: how fast you hit the wall.
Torque: how far you take the wall with you.
Oversteer: when you hit the wall with the back of the car.
Horsepower: how fast you hit the wall.
Torque: how far you take the wall with you.
Re: my penknife is stuck closed!
Clay is alkaline - very.
Ask me how I know
(We live in the Sussex weald, there's clay in the grounds of our house that's so pure it's blue, you could make pottery from it)
Ask me how I know
(We live in the Sussex weald, there's clay in the grounds of our house that's so pure it's blue, you could make pottery from it)
Some people are like Slinkies - they serve no useful purpose, but they still bring a smile to your face when you push them downstairs.
Re: my penknife is stuck closed!
Never mind. I won't be heart broken if it can't be fixed but it costs nothing to try. (at the minimum i will have some spare screwdriver bits and a pair of tweesers!)
I'll let you know if i manage to cut my fingers off while working on it
I'll let you know if i manage to cut my fingers off while working on it
Understeer: when you hit the wall with the front of the car.
Oversteer: when you hit the wall with the back of the car.
Horsepower: how fast you hit the wall.
Torque: how far you take the wall with you.
Oversteer: when you hit the wall with the back of the car.
Horsepower: how fast you hit the wall.
Torque: how far you take the wall with you.
- M Paul Lloyd
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Re: my penknife is stuck closed!
Leave it in a pot of plus gas for a week and then give it a blast with an airline.
May the light at the end of your long dark tunnel not be a train travelling the other way.
http://sciencefocus.com/forum/index.php ... e0b9d88e25
http://sciencefocus.com/forum/index.php ... e0b9d88e25
- Martin Evans
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Re: my penknife is stuck closed!
Sorry if this is going off topic but I was suddenly reminded of when I lost a cap off my head in the wind. It was during a period of bad weather and I was driving home. I had to stop, as the road was getting rather snowy and I wanted to let the front tyres down a bit (Mini), in anticipation of the mountain road. When I got out, the wind was worse than I realised and my cap flew over an embankment. I couldn't see where it had gone and the snow was deep.
A few days (Maybe a week later), as I approached the spot from the road below (The road, where it blew off, crossed via a bridge, the one I had to leave), I saw a sark spot on the snow drift. It was my cap (Frozen but in tact) . I had it dry cleaned and I still have it. It's always nice to get back something which you lost (Which reminds me I can't find my copy of the video shown below and it's no longer available...but there maybe one supplier who has one).
A few days (Maybe a week later), as I approached the spot from the road below (The road, where it blew off, crossed via a bridge, the one I had to leave), I saw a sark spot on the snow drift. It was my cap (Frozen but in tact) . I had it dry cleaned and I still have it. It's always nice to get back something which you lost (Which reminds me I can't find my copy of the video shown below and it's no longer available...but there maybe one supplier who has one).
Rules exist for the obedience of fools and the guidance of wise men.
MG Midget 1500, MGB GT V8, Morris Minor Traveller 1275, MG Midget 1275 & too many bicycles.
MG Midget 1500, MGB GT V8, Morris Minor Traveller 1275, MG Midget 1275 & too many bicycles.
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