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rustpreventionandremoval:rust_prevention_and_removal [2014/01/09 05:21] – [Sanding with dremel] eidisrustpreventionandremoval:rust_prevention_and_removal [2019/08/27 20:45] (current) – external edit 127.0.0.1
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 ===== How did it happen ===== ===== How did it happen =====
  
- First of all the good news. PCB's and their chips are very resistant to corrosion. Most of the times rust attacks steel and aluminum metal shieldings as well as various connectors which were directly or indirectly exposed to moisture. Rust does not form if ambient relative humidity is below 40%. The perfect level for storing is 35% - 40%. You can monitor it with hygrometer which is a must have and can be cheaply purchased on eBay. Don't go lower than 30% because that can lead to electrostatic build up.+ Warm air can hold more moisture than cold air. That is why humidity is much lower during winter (~30% - ~45%) and peaks during hot summer days (~45% - ~80%). Condensation occurs when air cools down and releases moisture, usually at night. Moisture tends to attach to the most coldest surfaces which are nearby. Unfortunately for us, it is metal.
  
-|  Item  |  Recommended relative humidity level  | +  * First of all the good news. PCB's and their chips are very resistant to corrosion. 
-|  Semiconductors  |  30 - 50%  | +  * Most of the times rust attacks steel and aluminum metal shieldings as well as various connectors which were directly or indirectly exposed to dirt and moisture. 
-|  Preventing Rust and Corrosion  |  below 55%, < 40% for no rust generation  | +  * Rust does not form if ambient relative humidity is below 40%. 
- +  * Recommended ambient relative humidity for semiconductors is 30 - 50% 
- Warm air can hold more moisture than cold air. That is why humidity is much lower during winter (~30% - ~45%) and peaks during hot summer days (~45% - ~80%). Condensation occurs when air cools down and releases moisture, usually at night. Moisture tends to attach to the most coldest surfaces which are nearby. Unfortunately for us, it is metal.+  * You can monitor it with hygrometer which is a must have and can be cheaply purchased on eBay. 
 +  * Don't go lower than 30% because that can lead to electrostatic build up.
  
 ===== Early symptoms ===== ===== Early symptoms =====
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 ===== Nail varnish ===== ===== Nail varnish =====
-Use it to cover exposed copper if solder mask gets damaged and to seal off areas which had lots of rust to seal off air and prevent oxidation.+Use it to cover exposed copper if solder mask gets damaged and to seal off areas which had lots of rust. This will prevent oxidation.
  
 ===== Baking soda ===== ===== Baking soda =====
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   * Set the dremel at high speed and start with 80 grit sanding disc.   * Set the dremel at high speed and start with 80 grit sanding disc.
-  * Use as light as pressure as possible and make contacts with surface for short periods of time to remove all heavy rust. You can use 120 grit just to be on the safe side. It will take more time but will be less agressive.+  * Use as light pressure as possible and make contacts with surface for short periods of time to remove all heavy rust. You can use 120 grit just to be on the safe side. It will take more time but will be less agressive.
   * Clean off the repairable area with baking soda paste in betwean. You will notice new scratches where rust used to be.   * Clean off the repairable area with baking soda paste in betwean. You will notice new scratches where rust used to be.
   * Move on to 180 grit sanding disc to clear those scratches which will reveal even finer scratches.   * Move on to 180 grit sanding disc to clear those scratches which will reveal even finer scratches.
-  * Move on to the next recommended grit as long as the scratches are gone or you are satisfied with the result.+  * Move on to the next recommended grit until the scratches are gone, you are satisfied with the result and all rust is gone.
   * Finish the repaired area by cleaning it with baking soda paste, contact cleaner and finally with rust converter.   * Finish the repaired area by cleaning it with baking soda paste, contact cleaner and finally with rust converter.
  
-You can use the following dremel accessories for sanding:+**You can use the following dremel accessories for sanding:** 
 + 
 +|{{:rustpreventionandremoval:sanding_disc.jpg?150|}}| 
 +|  Sanding Discs  |
  
-Sanding discs: 
   * 80 grit   * 80 grit
   * 120 grit   * 120 grit
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   * 2000 grit   * 2000 grit
  
-Rubber discs: +|{{:rustpreventionandremoval:rubber_polishing_wheels.jpg?150|}}| 
-White - for stripping metal +|  Rubber Polishing Wheels  |
-Black - for removing extra solder and deep scratches +
-Blue  - for satin finish +
-Pink ? (peach) ? - for mirror finish+
  
-|{{:rustpreventionandremoval:3m_radial_bristle_discs.jpg?300|}}|+|Black  |  120 grit| 
 +|Red  |  150 grit| 
 +|Green  |  180 grit| 
 +|Blue  |  220 grit| 
 +|Gray  |  240 grit| 
 +|Purple  |  320 grit| 
 + 
 +|{{:rustpreventionandremoval:3m_radial_bristle_discs.jpg?150|}}|
 |  3M Radial Bristle Discs  | |  3M Radial Bristle Discs  |
  
- +|Yellow  |  80 grit|
-||Yellow  |  80 grit|+
 |White  |  120 grit| |White  |  120 grit|
 |Red  |  220 grit| |Red  |  220 grit|
 |Blue  |  400 grit| |Blue  |  400 grit|
 +|Pink  |  1200 grit|
 |Peach  |  6 micron| |Peach  |  6 micron|
-|Green  |  1 micron||+|Green  |  1 micron|
  
-Radials are great for fine works and when you need to remove rust from hard to reach places. Usually where metal is bent.+**Radials are great for fine works and when you need to remove rust from hard to reach places, usually where metal is bent.**
  
-Here are explanations of sandpaper grits:+**Here are explanations of sandpaper grits:**
 http://en.wikipedia.org/wiki/Sandpaper http://en.wikipedia.org/wiki/Sandpaper
  
-Acetone +===== Electrolysis ===== 
-======= +Work in progress.
-Can be used to remove galvanized protective coating from steel and strip it to bare metal. Use rust converter as soon as you have cleaned your part to avoid flash rust. +
- +
-Electrolysis +
-============ +
-Comming soon. +
- +
-Molasses+
  
--=Preserving=-+====== Protecting ====== 
 +Work in progress.
  
--Zinc spray +Possible candidates are: 
--Transparent lacquer +  * Silicone oil 
--DIY galvanizing+  * Zinc spray 
 +  * Transparent lacquer 
 +  * DIY galvanizing
  
-Conclusion +====== Conclusion ====== 
-========== +All purists will agree that the restored console or computer will never look the same. That is completely true so if anyone is experienced and knows more efficient way of doing a restoration, please share your knowledge and help us grow. Please keep in mind that this is a DIY so most of us do not have access to expensive industrial machinery. Please share your thoughts and suggestions in the forum or contact forum member Eidis if you have any suggestions on how to improve this guide.
-All purists will agree that the restored console or computer will never look the same. That is completely true so if anyone is experienced and knows more efficient way of doing a restoration, please share your knowledge and help us grow. Please keep in mind that this is a DIY so most of us do not have access to expensive industrial machinery.+
  
-Sources:+Keep the scene alive !
  
-http://www.engineeringtoolbox.com/relative-humidity-production-process-d_511.html+Eidis
  
rustpreventionandremoval/rust_prevention_and_removal.1389208900.txt.gz · Last modified: 2019/08/27 20:44 (external edit)