IPC-TM-650 EN 2022 试验方法-- - 第170页

IPC-TM-650 Number Subject Date Revision Page 2 of 2 2.3.24 Porosity of Gold Plating 2/78 5.2.7 Compress the assembly so that the pressure between the cadmium sulfide paper and the sample is uniform and between 14 kg/cm2 …

100%1 / 824
1 Scope
This test procedure is designed to measure the
level of extractable ionic contamination on the surface of
printed boards and printed board assemblies by ion chroma-
tography.
2 Applicable Documents
Measurement of Extractable/Leachable
Anion Contamination Levels on Drive Components by Ion
Chromatography (IC)
Cleaning and Cleanliness Test Program, Phase
III, Water Soluble Fluxes, Part 1: B-24, lnteractions of Water
Soluble Fluxes with Metal/Substrates
Cleaning and Cleanliness Test Program, Phase
III, Water Soluble Fluxes, Part 2: B-36, Comparison to Phase
1 Rosin Benchmark
An In-Depth Look at Ionic Cleanliness Testing
Users Guide for Cleanliness of Unpopulated
Printed Boards
‘‘Setting Up Ion Chromatography Capability’’
3 Test Specimens
3.1
Printed board and/or printed board assembly for extrac-
tion
4 Apparatus and Material
4.1
Ion Chromatograph capable of accurately measuring ion
concentrations down to 0.5 parts per million (ppm). The
equipment and chemistry should be set up and standardized
per the manufacturer’s instructions. The separation column
and eluent composition should be chosen to provide baseline
resolution between the ions of interest.
4.2
Hot water bath capable of maintaining 80 ± 2 °C [176 ±
3.6 °F].
4.3
Clean extraction vessels.
4.4
Clean labware (Ionic free).
4.5
Cleanroom vinyl gloves. (<3 ppm of Cl).
4.6
Deionized water with a resistivity of at least 18.0
megohm-centimeter.
4.7
IC or ACS grade chemicals for eluent and regenerant
preparation.
4.8
National standard - traceable calibration standards (e.g.,
NIST traceable).
4.9
Volumetric Flasks (Typically 25, 50, 100, and 1000ml).
4.10
Precision Pipetting Equipment (such as Eppendorf).
5 Test Procedures
5.1 Extraction Procedure
Select a low-ion extraction bag
sized to fit the board with approximately 2.5 cm [1.0 in]
excess on each side to minimize required extract solution,
with several inches at the top to allow for air expansion when
the bag is heated.
See for an IPC-
TM-650 Equipment Vendor Listing for possible vendors.
5.1.1
Use clean gloves and or tongs when handling the
samples to be tested. Place each sample in an extraction bag.
5.1.2
Prepare a 75/25 (± 5%) v/v 2-propanol/H
2
0 solution
for the extraction.
A tolerance was added to the IC method because it is
a more specific and accurate method by comparison to the
ROSE method.
5.1.3
Add a known volume of the extraction solution to
the extraction bag covering the sample (approximately
0.5 mL/cm
2
of surface area).
5.1.4
Add the same volume of extraction solution to an
empty bag of the same lot for use as a blank.
5.1.5
Suspend the bags in the 80 ± 2°C [176 ± 3.6°F] water
bath allowing the water to force most of the air from the bags.
Do not allow any of the water from the water bath into the
extract solution in the bags. Fold the top of the bags over the
suspending bar and clip in place with binder clips. This will
3000 Lakeside Drive, Suite 309S
Bannockburn, IL 60015-1249
IPC-TM-650
TEST METHODS MANUAL
Number
2.3.28
Subject
Ionic Analysis of Circuit Boards, Ion
Chromatography Method
Date
11/12
Revision
B
Originating Task Group
Ionic Conductivity / Ion Chromatography Task
Group (5-32a)
Association
Connecting
Electronics
Industries
IDEMA
M13-99
IPC-TP-1043
IPC-TP-1044
IPC-TR-583
IPC-5701
IPC-WP-008
Note:
www.ipc.org/html/testmethods.htrn
Note:
Material
/n
this
Test
Methods
Manual
was
voluntarily
established
by
Technical
Committees
of
I
PC.
This
material
/s
advisory
only
and
"s
use
or
adaptation
，
s
entirely
voluntary.
IPC
disclaims
all
liability
of
any
kind
as
to
the
use,
application,
or
adaptation
of
this
material.
Users
are
also
wholly
responsible
for
protecting
themselves
against
all
claims
or
liabilities
for
patent
infringement.
Equipment
referenced
/s
for
the
convenience
of
the
user
and
does
not
imply
endorsement
by
IPC.
Page
1
of
3
IPC-TM-650
Number
Subject Date
Revision
Page 2 of 2
2.3.24
Porosity
of
Gold
Plating
2/78
5.2.7
Compress
the
assembly
so
that
the
pressure
between
the
cadmium
sulfide
paper
and
the
sample
is
uniform
and
between
14
kg/cm2
and
18
kg/cm2.
5.2.8
While
the
assembly
is
under
compression,
pass
a
smooth,
ripple
free
DC
source
not
exceeding
12
volts
between
the
cathode
and
anode.
5.2.9
Set
the
current
initially
at
8
mA/cm2
of
anode
area
and
energize
for
30
seconds.
5.2.10
Allow
the
electrograms
produced
on
the
cadmium
sulfide
paper
to
dry.
5.2.11
A
corresponding
brown
stain
on
the
paper
reveals
the
presence
of
any
defect
in
the
plated
coating.
5.2.12
Visually
examine
the
specimen
at
10X
magnification.
5.3
Gold
on
Nickel
Method
5.3.1
Soak
the
Whatman
542
filter
paper
for
1
0
minutes
in
a
0.8%
solution
of
nioxime
(cyclohexane
1:2
dione
dioxime)
and
distilled
water.
5.3.2
Remove
the
excess
solution
with
blotting
paper.
The
paper
must
be
hung
up
to
dry.
5.3.3
Repeat
the
steps
in
5.2,
except
moisten
the
piece
of
nioxime
paper
with
distilled
water
and
expose
the
ammonia
vapor.
5.3.4
Remove
the
excess
by
blotting.
The
“backing
pad”
of
photographic
blotting
paper
is
to
be
used
dry.
5.3.5
Expose
the
electrograms
produced
on
the
nioxime
paper
to
ammonia
vapor,
then
allow
to
dry.
5.3.6
A
corresponding
purple-red
stain
on
the
paper
reveals
the
presence
of
any
defects
in
the
gold
plating.
5.3.7
Visually
examine
the
specimens
at
10X
magnification.
The Institute for Interconnecting and Packaging Electronic Circuits
2215 Sanders Road • Northbrook, IL 60062-6135
Material in this Test Methods Manual was voluntarily established by Technical Committees of the IPC. This material is advisory only
and its use or adaptation is entirely voluntary. IPC disclaims all liability of any kind as to the use, application, or adaptation of this
material. Users are also wholly responsible for protecting themselves against all claims or liabilities for patent infringement.
Equipment referenced is for the convenience of the user and does not imply endorsement by the IPC.
Page 1 of 3
IPC-TM-650
TEST
METHODS
MANUAL
Number
2.3.24.1
Subject
Porosity
Testing
of
Gold
Electrodeposited
on
a
Nickel
Plated
Copper
Substrate
Electrographic
Method
Date
Revision
10/85
Originating
Task
Group
N/A
1
Scope
This
test
method
provides
a
procedure
for
testing
the
porosity
of
gold
electroplated
from
an
alkaline
(cyanide),
acid,
or
neutral
gold
plating
solution
on
a
nickel
substrate
in
contact
with
the
gold
deposit.
2
Applicable
Documents
None
3
Materials
and
Equipment
3.1
Materials
Acetone,
Sodium
Nitrate,
Reagent
GD.
(NaN03),
Sodium
Carbonate,
Anhydrous,
Reagent
GD.
(Na
2co
3),
Dimethylglyoxime,
Denatured
Ethyl
Alcohol
No.
3A,
Reagent
GD.
(C2H50H),
Photographic
Paper
with
Silver
Halide
removed.
(Kodabromide,
glossy
finish,
single
wt.
pho¬
tographic
paper
(fixed
before
use),
Ammonium
Hydroxide,
Reagent
GD.
(NHQH)
3.2
Equipment
3.2.1
DC
power
supply
to
0
amp
to
1
amp.
DC
minimum,
0
volts
to
1
0
volts
3.2.2
DC
Milliammeter,
0
mA
to
100
mA
3.2.3
Electrographic
Clamp-Press
4
Equipment/Apparatus
None
5
Procedure
5.1
Solution
Make
Up
5.1.1
Electrolyte
Concentration:
NaN03
1%
(wt.)
Na2C03,
Anhydr.
4%
(wt.)
Distilled
water
-
balance
by
wt.
Preparation
of
500
g
(Vol.
of
485
±
1
0
ml.)
of
solution
5.1.
1.1
Obtain
the
tare
weight
of
600-ml
glass
beaker.
5.1.
1.2
Add
400
ml
of
distilled
water
to
beaker.
5.1.
1.3
Using
agitation
and,
if
necessary,
heating
to
48.9℃,
dissolve
the
following
in
the
water:
Sodium
nitrate
-5g
Sodium
carbonate
-
20
g
5.1.
1.4
After
salts
are
dissolved,
add
distilled
water
until
the
net
weight
of
the
solution
is
500
g.
5.1.
1.5
Cool
the
solution
to
room
temperature
before
use.
5.2
Indicator
Solution
The
solution
is
a
concentration
of
dimethylglyoxime
-
1%
(wt.)
denatured
ethyl
alcohol
No.
3A
-
Balance.
Perform
the
preparation
of
300
g
(vol.
of
380
±
10
ml.)
of
solution
as
explained
in
5.2.1
through
5.2.4.
5.2.1
Obtain
the
tare
weight
of
400-ml
glass
beaker.
5.2.2
Add
275
ml
denatured
ethyl
alcohol
to
the
beaker.
5.2.3
Using
agitation
only
(do
not
heat),
dissolve
3
g
of
dim¬
ethylglyoxime
in
the
alcohol.
5.2.4
After
all
additions
are
dissolved,
add
denatured
ethyl
alcohol
until
the
net
weight
of
the
solution
is
300
g.
5.3
Electrographic
Test
5.3.1
Cleaning
Procedure
5.3.1.
1
Using
a
cloth,
wash
the
contact
area
with
alconox
solution.
5.3.1.
2
Rinse
the
contact
area
in
tap
water.
5.3.1.
3
Rinse
the
contact
area
in
deionized
water.
5.3.1.
4
Rinse
the
contact
area
with
acetone
and
air
dry.
5.4
Cut
a
piece
of
silver
halide-free
photographic
paper
to
a
size
slightly
larger
than
the
area
of
the
sample
or
part
of
the
sample
being
tested.
The
dimensions
of
the
photographic
paper
should
not
exceed
the
dimension
of
that
part
of
the
sample
being
porosity
tested
by
more
than
0.79375
mm
in
any
one
direction.
5.5
Wet
the
photographic
paper,
cut
in
5.2
with
the
electro¬
lyte
solution
prepared
in
5.1
.1
.
The
photographic
paper
is
immersed
for
30
minutes
or
more
in
the
electrolyte.