osp reaction mechanism
Post on 12-Nov-2014
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OSP reaction mechanismOSP reaction mechanismOrganic film is formed by azole compound in OSP material.
WPF106A and WPF15 have benz-imidazole ,KESTER has imidazole and triazole
Reaction mechanism»
azole compounds adsorption
on exposed copper surface
NH
N
R
NH
N
R
NH
N
N
benz-imidazole imidazole triazole
*note: R means branched chain, and is different between each OSP materials
copper land
NH NH NH
N
R
N
R
N
R
(2) Hydrogen(proton) elimination
and dehydration
copper land
N-
N
R
Cu+N-
N
R
Cu+N-
N
R
Cu+
+ H2O
OSP reaction mechanismOSP reaction mechanism
chelate formation
copper land
N-
R
Cu+
N:
N-
R
Cu+
N:
N-
R
Cu+
N:
copper land
N
R
Cu+
N:
N
R
Cu+
N:
N
R
Cu+
N:
N
R
Cu++
N:
N
R
N:
N
R
N:
Cu++ Cu++
(4) Organic film formation
Copper chelate is formed by Cu2+ in OSP material or Copper surface on PWB
KESTER has no Cu2+
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