Differences

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

--- cleaning [2013/10/20 14:59] – external edit 127.0.0.1
+++ cleaning [2013/11/17 06:47] – mcmaster
@@ Line 173: / Line 173: @@
 "find a polyimide layer that was not entirely removed by HNO3 but which can be dissolved with ethylendiamine" ([[http://static.usenix.org/publications/library/proceedings/smartcard99/full_papers/kommerling/kommerling_html/|ref]])
+==== Ethylendiamine ====
+From [Beck 23]
+Procedure:
+  * Use straight (how much?)
+  * 100° C for 15-60
+==== Ethylendiamine + hydrazine monohydrate ====
+From [Beck 23].  Use this if plain ethylendiamine does not work.  Unclear if it has a higher corrosion potential, but heed the safety warning
+Procedure:
+  * Mix (how much?)
+    * 7 mL 80% hydrazine monohydrate
+    * 1 mL ethylendiamine
+  * 100° C for 15-60?
+Notes:
+  * WARNING: spontaneous combustion can occur over 120° C
+==== Ethylendiamine + hydrazine monohydrate ====
+Procedure:
+  * Mix
+    * 3 mL ethylendiamine
+    * 1 mL 98% acetic acid
+  * Cook 120-130° C for 10-30 minutes
+Notes:
+  * Mix slowly (or what?)
+  * Stir vigorously
+==== Caro's acid ====
+Procedure:
+  * Mix
+    * 7 mL (98%?) H2SO4
+    * 1 mL 30% H2O2
+  * Cook at 80° C
+==== Fuming nitric acid (FNA) ====
+When decapping part with WFNA/RFNA the amide layer will usually be simply dissolved [Beck 26, personal experience]
+Beck mentions "imide"?
+==== Oxygen plasma ====
+"Polymides can usually be removed gently without leaving residues by incineration in the oxygen plasma" [Beck 26]
+==== Dimethyl sulphoxide + ethanolamine ====
+Procedure:
+  * Mix
+    * 3 mL dimethyl sulphoxide
+    * 1 mL part ethanolamine
+  * Cook at 110° C
+WARNING:
+  *  Spontaneous combustion above 120° C