[928uk] OT - soap as a releasing fluid

[jon928se at gmail.com]

Different (effective) grades of stainless between the blades and the pin. The same notional grade lets say 316 will be heat treated differently to make blades than pins. This will affect the electrode potential of the different pieces which will enable corrosion between them.  

There are so many quirks with stainless it's almost unbelievable - Even different forging or rolling methods can affect the electrode potential of the same allow.

I don't know the chemical composition of dishwasher detergent but it wouldn't surprise me to find that there is some salt (NaCl)in the mix like in conventional washing liquid, and not forgetting that most dishwashers require salt as a water softener in the UK. Just the tiny residue of salt after rinsing will leave behind a nice environment for dissimilar metal corrosion to start.

Jon in Sydney

-----Original Message-----
From: 928uk <928uk-bounces at lists.928.org.uk> On Behalf Of Paul R Smith via 928uk
Sent: 04 June 2024 18:40
To: 928uk at lists.928.org.uk
Subject: [928uk] OT - soap as a releasing fluid

Soap seems to meet the criteria, without having to go and buy it.

And on the subject of soap......

I have several pairs of stainless steel scissors in the kitchen cutlery drawer, and over time, they become stiff and get thrown to the back of the drawer. The other day I found that they were all stiff. They often get put through the dishwasher, but all show signs of rust residue around the pivot. So, I was working one of them back and forth to try to free up the pivot, but it wasn't getting easier. I looked for the nearest lubricant, and chose the hand washing liquid soap. A dab of this around the pivot, and worked the joint, and very quickly the joint freed up and the rust started to work out of the joint.

So, two questions: 1) Why is there rust in the joint between two pieces of stainless steel and a pin which doesn't rust on the outside? 2) Does this hand-soap have some mystical rust removing properties?

I'll have to give it a go on some old stiff pliers.

Smiffy

On 04/06/2024 03:51, Jon Holdsworth via 928uk wrote:
> I wouldn't use red rubber grease. Yes it won't harm the rubber - good. But all else being equal will remain as a lubricant nearly indefinitely. The bushes aren't supposed to be lubricated as they act as a secondary spring.
>
> Use KY jelly - completely rubber safe and will remain lubricating for long enough to do the install and will then dry out. If it gets wet it will just get washed out.
>
> If you are easily embarrassed don't go into the chemist with your mechanicing friend to buy a large tube to facilitate reinstallation of the TT tube bearings. BTDT.
>
> Jon