IPC-TM-650 EN 2022 试验方法.pdf - 第187页

6 Notes 6.1 Ions which may be included for evaluation are as follows: Anions: Bromide Chloride Fluoride Nitrate Nitrite Phosphate Sulfate Cations: Ammonium Calcium Lithium Magnesium Potassium Sodium Weak Organic Acids: A…

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.

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

min.).

5.1.7 Remove the bags from the water bath and allow the

solution within the bag to cool to ambient temperature before

opening.

5.1.8 Gently mix the contents. Transfer solution to virgin

sample vials for analysis or pull the sample solution directly

from the bag using a clean syringe for manual injections.

5.1.9 Remove the test sample from the bag using gloved

hands or other clean device.

5.2 Analytical Procedure

5.2.1

The analysis of the extract solution should be done as

soon as possible after extraction, but shall be no longer than

four days from the extraction date.

5.2.2 Start the chromatograph per the manufacturer’s rec-

ommended method and allow it to come to a stable baseline.

5.2.3 Analyze sample solutions for anion and/or cation

content, utilizing best analytical technique and laboratory

practices.

5.3 Calculation of Results

5.3.1

Values from the chromatograms are typically reported

in parts per million (ppm, µg/mL).

5.3.2 Record the surface area of the printed board or

printed board assembly. Recommended area calculations for

the unpopulated printed board and the printed board assem-

bly are the following:

Printed Board Surface Area = Length x Width x 2

Printed Board Assembly Surface Area = (Length x Width x 2)

+ (1 x up to 50% of the printed board area)

Great caution should be taken in interpretation and compari-

son of these results as assembly surface areas will often devi-

ate by more than 10% of its’ unpopulated state.

Note: There is no standardized way for estimating the sur-

face area of components. Traditionally, values from 10 to 50%

have been used for estimating component area.

5.3.3 Results may be expressed as micrograms (µg) of ion

per square centimeter or micrograms (µg) of ion per square

inch based on the extraction volume and the calculated

sample surface area.

µg/cm

or µg/in

= (SC - BL) x Vol / Area

Where:

SC = ppm from IC (µg/mL)

BL = ppm from the bag blank

Vol = final volume (ml)

Area = surface area (cm

or in

)

Note: ‘‘ppm’’ value is actually specimen value minus blank

value.

5.3.4 Report all ions quantified.

5.3.5 Report the surface area used in the calculation and

the percentage increased in calculating the surface area of a

printed board assembly.

IPC-TM-650

Number

2.3.28

Subject

Ionic Analysis of Circuit Boards, Ion Chromatography Method

Date

11/12

Revision

Page2of3

6 Notes

6.1

Ions which may be included for evaluation are as

follows:

Anions:

Bromide

Chloride

Fluoride

Nitrate

Nitrite

Phosphate

Sulfate

Cations:

Ammonium

Calcium

Lithium

Magnesium

Potassium

Sodium

Weak Organic Acids:

Acetate

Adipate

Formate

Glutamate

Malate

Methane Sulfonate

Succinate

Phthalate

Other ions of interest may be present.

6.2 Alternate extraction techniques (change in time, tem-

perature, or extraction solution) may be used as agreed

between user and supplier (AABUS).

6.2.1 Examples of alternate extraction times include the

following:

• Ten-minute extraction (IDEMA specification for metal parts)

• Twenty-four hour extraction

• 16 hour extraction per J-STD-004

6.2.2 Examples of alternate extraction temperatures include

the following:

• Ambient temperature (22±3°C[72±5°F])

6.2.3 Examples of alternate extraction solutions include the

following:

• 10/90 v/v 2-propanol/DI water

• Deionized water

6.3 Ion Chromatography may be a destructive test for

samples due the high temperature liquid extraction and lack of

protection for electrostatic sensitive devices (ESD), moisture

sensitive devices (MSD), and non-hermetically sealed devices.

Note: Caution should be taken when testing samples that

are intended to be deliverable production assemblies.

IPC-TM-650

Number

2.3.28

Subject

Ionic Analysis of Circuit Boards, Ion Chromatography Method

Date

11/12

Revision

Page3of3

Scope

This

test procedure is designed to measure the

level of chloride, bromide, and fluoride present in a soldering

flux or paste by Ion Chromatography.

2 Applicable Documents

IPC J-STD-004

Requirements

for Soldering Fluxes

IPC-TM-650

Test

Methods Manual

2.3.34 Solids Content, Flux

Test Specimens

3.1

Liquid

flux, solder paste, paste flux, extracted solder

preform flux, or cored wire. The reflow/extraction process

should be carried out in accordance with J-STD-004 for the

solder preforms.

Apparatus and Material

4.1

Ion

Chromatograph capable of 50 ppb or better detec-

tion. The equipment and chemistry should be set up and stan-

dardized per the manufacturer’s instructions.

4.2

Hot

Water Bath capable of maintaining 80 ± 5 °C [176 ±

9 °F].

4.3

Clean,

heat sealable bags, i.e., KAPAK® 500 series or

equivalent, with less than 250 ppb extractable contaminants.

(Specify cleanliness level or manufacturers’ part number.)

4.4

Cleanroom

vinyl gloves. (<3 ppm of Cl).

4.5

Deionized

water with a resistivity of at least 18.0

megohm centimeter.

4.6

HPLC

or ASC grade chemicals for eluent and regener-

ant preparation.

4.7

NIST

traceable standards for chloride, bromide and fluo-

ride.

4.8

2-Propanol

(IPA), Electronic grade or better.

4.9

Solder

Pot.

4.10

Analytical

Balance capable of measuring 0.001g.

4.11

mm [1.969 in] mandrel.

4.12

Clean

wire cutters.

4.13

Heat

sealer.

4.14

Ion-free

containers.

4.15

Ultrasonic

bath or magnetic stirrer and stir bar.

4.16

Ion-free

syringe filters.

4.17

Test

Tube.

Procedures

5.1 Liquid Flux / Extracted Flux

5.1.1

Prepare

a solution of 10% by volume isopropyl alcohol

and 90% by volume deionized water and dilute the liquid flux

sample to 200X.

5.1.2

Filter

samples through ion-free syringe filters to

remove particulate prior to analysis.

5.2

Solder Paste/Paste Flux

5.2.1

Weigh

to the nearest 0.001 g., approximately one (1)

gram of solder paste and place it into a tared 165 mm

[6.496 in] by 200 mm [7.874 in] Kapak® bag containing 50 ml

of a solution of 10% by volume isopropyl alcohol and 90% by

volume deionized water.

5.2.2 Prepare

a blank by adding 50 ml of the extract solu-

tion to an empty bag.

5.2.3

Label

and heat seal the bags and place them into a

hot water bath maintained at 80 °C [176 °F].

2215

Sanders Road

Northbrook, IL 60062-6135

IPC-TM-650

TEST

METHODS MANUAL

Number

2.3.28.1

Subject

Halide

Content of Soldering Fluxes and Pastes

Date

06/04

Revision

Originating Task Group

Flux Specifications Task Group (5-24a)

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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