IPC-TM-650 EN 2022 试验方法.pdf - 第190页

5.5.2.2 Determine the weight of flux solids in the solder paste flux: Weight of flux solids (g) in solder paste flux = [Weight of solder paste sample (g)] x [% Flux in solder paste / 100] x [% Solids in paste flux / 100]…

5.2.4

After

16 hours ± one hour, remove the bags from the

water bath and shake vigorously for 10 seconds to mix the

contents.

5.2.5

Allow

the solutions to cool for 30 minutes minimum

before transferring the extract solutions to ion-free plastic con-

tainers.

5.2.6

Filter

samples through ion-free syringe filters to

remove particulate prior to analysis.

5.3

Flux-Cored Solder Wire

5.3.1

Weigh

approximately fifty (50) grams of the wire

sample.

5.3.2 Wrap

the specimen around a 50 mm [1.969 in] diam-

eter mandrel (Note: Touch the cut ends of the sample with a

soldering iron to seal the sample while cleaning). Place the

resultant sample coil into a beaker of boiling deionized water.

5.3.3

After

approximately five (5) minutes, remove the coil

from the boiling water, rinse with isopropyl alcohol, and allow

to air dry.

5.3.4

After

drying, cut the sample into approximately one (1)

centimeter [0.394 in] length pieces and place inside of a test

tube.

5.3.5

Place

the test tube, with diced sample, in a solder

bath. Thirty (30) seconds after the sample is completely

reflowed, remove the test tube and then allow the solder to

solidify.

5.3.6

Upon

solidification of the solder and before solidifica-

tion of the flux, pour approximately 0.2 grams of the flux into

a test tube of known weight.

5.3.7

Weigh

the second test tube containing the flux and

subtract off the test tube weight to determine the weight of

the flux sample.

5.3.8

Add

a known volume of isopropyl alcohol to the

sample test tube and place the test tube into a sonicator or on

a magnetic stirrer with a stir bar in the test tube for approxi-

mately thirty (30) minutes.

5.3.9

Once

the flux sample is dissolved, dilute the sample

solution such that the overall concentration of isopropyl alco-

hol is approximately 10%.

5.4

Test Method

5.4.1

Extract

solutions shall be analyzed using an Ion Chro-

matograph with a three to five level calibration.

5.4.2

Dilute

extract solutions further with a 10% by volume

isopropyl alcohol solution, if necessary, to lower ion concen-

tration levels within the calibration ranges of the chromato-

graph.

5.5

Calculations

5.5.1 Liquid Flux

5.5.1.1

Determine

the weight of each halide ion in the liquid

flux:

Weight of halide ion (g) in liquid flux =

[ppm from IC (µg/mL)] x

[Dilution factor, if necessary] x

[Volume of dilution solution (ml)] x 10

-6

Note: ‘‘ppm

from IC’’ value is actually specimen value minus

blank value.

5.5.1.2

Determine

the weight of flux solids in the liquid flux:

Weight of flux solids (g) in liquid flux =

[Volume of liquid flux sample (ml)] x

[Density of liquid flux sample (g/ml)] x

[% Solids in liquid flux / 100]

5.5.1.3

Calculate

percent of each halide ion in the nonvola-

tile solid portion of the liquid flux:

Percent of halide ion in solid portion of liquid flux =

[Weight of halide ion (g) in liquid flux] x 100

[Weight

of flux solids (g) in liquid flux]

5.5.2

Solder Paste

5.5.2.1

Determine

the weight of each halide ion in the sol-

der paste flux:

Weight of halide ion (g) in solder paste flux =

[ppm from IC (µg/mL)] x

[Dilution factor, if necessary] x

[Volume of extract solution (mL)] x 10

-6

IPC-TM-650

Number

2.3.28.1

Subject

Halide

Content of Soldering Fluxes and Pastes

Date

06/04

Revision

age2of3

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5.5.2.2

Determine

the weight of flux solids in the solder

paste flux:

Weight of flux solids (g) in solder paste flux =

[Weight of solder paste sample (g)] x

[% Flux in solder paste / 100] x

[% Solids in paste flux / 100]

5.5.2.3 Calculate

the percentage of each halide ion in the

nonvolatile solid portion of the liquid flux:

Percent of halide ion in solid portion of solder paste flux =

[Weight of halide ion (g) in solder paste] x 100

[Weight

of flux solids (g) in solder paste]

5.5.3

Flux-Cored Solder Wire

5.5.3.1

Determine

the weight of each halide ion in the sol-

der wire flux:

Weight of halide ion (g) in solder wire flux =

[ppm from IC (µg/mL)] x

[Dilution factor, if necessary] x

[Volume of dilution solution (ml)] x 10

-6

5.5.3.2

Determine

the weight of flux solids in the solder wire

flux:

Weight of flux solids (g) in solder wire flux =

[Weight of flux sample (g)] x [% Solids in flux / 100]

5.5.3.3 Calculate percent of each halide ion in the nonvola-

tile solid portion of the solder wire flux:

Percent of halide ion in solid portion of solder wire flux =

[Weight of halide ion (g) in flux] x 100

[Weight

of flux solids (g) in flux]

Notes

6.1

When

establishing an ion chromatography method, the

containers utilized for extraction and sample processing

should be evaluated to confirm that error is not introduced by

the chosen ‘‘ion-free’’ containers.

6.2

Safety

Observe

all appropriate precautions on MSDS

for chemicals involved in this test method.

IPC-TM-650

Number

2.3.28.1

Subject

Halide

Content of Soldering Fluxes and Pastes

Date

06/04

Revision

age3of3

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1 Scope This test procedure is designed to measure the

level of anionic and cationic residues on the surface of

unpopulated (bare) printed boards by ion chromatography.

2 Applicable Documents

IPC-WP-008

Setting Up Ion Chromatography Capability

3 Test Specimen Any printed board

4 Apparatus and Materials

4.1

Ion Chromatograph capable of accurately measuring ion

concentration down to 0.5 parts per million (ppm). The equip-

ment and chemistry should be set up and standardized per

the manufacturer’s instructions. The separation column and

eluent composition should be chosen to provide good sepa-

ration of 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.

4.5 Clean gloves, e.g., cleanroom vinyl gloves. (<3 ppm of

Chloride).

4.6 Deionized water with a starting resistivity of at least 16.0

megohm-centimeter.

4.7 HPLC or ACS grade chemicals for eluent and regener-

ant preparation.

4.8 National standard - traceable calibration standards (e.g.,

NIST traceable).

Note: At the time of publication of this test method, a trace-

able industry adipic acid standard does not exist. Future revi-

sions to this test method will indicate such traceability when

available.

4.9 2-Propanol (IPA), 99.5% ACS grade or better.

4.10 Volumetric Flasks (Typically 25, 50, 100, and 1000 ml)

4.11 Precision Pipetting Equipment (such as Eppendorf)

4.12 Ionics-free extract solution sample containers or auto-

sampler vials if an auto-sampler is used with the instrument.

Clean syringes should be used for manual injections.

5 Test Procedures

5.1 Extraction Procedure

Select a low-ion extraction bag

sized to fit the board with approx. 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.

5.1.2 Use clean gloves when handling the samples to be

tested. Place each sample in an extraction bag.

5.1.3 Prepare a 10%/90% volume/volume 2-propanol /

deionized water solution for the extraction.

5.1.4 Add a known volume of the extraction solution to

the extraction bag covering the printed board (approx. 0.5

mL/cm

of surface area).

5.1.5 Add the same volume of extraction solution to an

empty bag of the same lot for use as a blank.

5.1.6 Suspend the bags into 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

minimize solvent loss during the extraction, yet not create a

sealed bag. Alternatively, the bags may be heat sealed after

forcing most of the air from the bag.

5.1.7 Allow the sample to soak for one hour (-0 min., +5

min.).

5.1.8 Remove the bags from the water bath and allow the

bags/solution to cool to room temperature.

3000 Lakeside Drive, Suite 309S

Bannockburn, IL 60015-1249

IPC-TM-650

TEST METHODS MANUAL

Number

2.3.28.2

Subject

Bare Printed Board Cleanliness by Ion

Chromatography

Date

12/2009

Revision

Originating Task Group

Ion Chromatography/Ionic Conductivity Task Group

(5-32a)

Material in this Test Methods Manual was voluntarily established by Technical Committees of 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 IPC.

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