Differences

This shows you the differences between two versions of the page.

--- rustpreventionandremoval:rust_prevention_and_removal [2014/01/09 06:07] – [Sanding with dremel] eidis
+++ rustpreventionandremoval:rust_prevention_and_removal [2019/08/27 20:45] (current) – external edit 127.0.0.1
@@ Line 5: / Line 5: @@
 ===== 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 =====
@@ Line 115: / Line 116: @@
 ===== 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 =====
@@ Line 143: / Line 144: @@
   * 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 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.
-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
@@ Line 160: / Line 161: @@
 |{{:rustpreventionandremoval:rubber_polishing_wheels.jpg?150|}}|
-|  Rubber Polshng Wheels  |
+|  Rubber Polishing Wheels  |
 |Black  |  120 grit|
@@ Line 188: / Line 189: @@
 Work in progress.
-====== Preserving ======
+====== Protecting ======
 Work in progress.
@@ Line 201: / Line 202: @@
 Keep the scene alive !
 Eidis