IPC-TM-650 EN 2022 试验方法.pdf - 第195页

1 Scope This test method is designed to determine the removal effect the flux has (if any) on the bright copper mirror film which has been vacuum deposited on clear glass. 2 Applicable Documents IPC J-STD-004 Requirement…

Scope

This

test method is used to measure pH in anhy-

drous fluorocarbon azeotropes and blends in cleaning and

defluxing equipment.

This method does not work in the presence of organic acid

acceptors normally present with chlorinated solvents, namely

1,1,1-trichloroethane and trichloroethylene.

Applicable Documents

None

Test Specimen

3.1

Approximately

25 ml samples of solvent are taken from

the boiling sump and condensate rinse sump of the operating

fluorocarbon vapor defluxer or degreaser and, for comparison

purposes, from the virgin solvent supply.

Equipment/Apparatus

4.1

indicator sticks TM ‘‘colorpHast’’® cat. #9590 avail-

able from MCB Manufacturing Chemists Inc., 2909 Highland

Ave., Cincinnati, OH 45212

4.2

Screw

cap glass vials (50 ml, three or six required per

test)

4.3

Graduated

glass cylinders (50 ml, three required per

test)

Caution: Plastic is sometimes attacked by solvents such as

acetone, methylene chloride azeotropes.

Procedure

5.1

Transfer

25 ml of virgin solvent to a clean vial using a

clean, dry graduated cylinder, insert a ‘‘colorpHast’’® plastic

strip, and cap the vial.

5.2

Repeat

5.1, sampling the defluxer or degreaser boiling

sump.

5.3

Repeat

5.1, sampling the condensate or rinse sumps.

5.4

Allow

the test vials to stand 30 minutes.

5.5

Compare

the colors on the test sticks with the ‘‘color-

pHast’’® color key and record the matching pH value.

5.6

Discard

the ‘‘colorpHast’’® indicator sticks and vials

after emptying the solvent into the boiling sump.

5.7

Rinse

the graduated cylinders with virgin solvent, empty

into the boiling sump, and allow to dry for reuse.

5.8

With

fluorocarbon/acetone and fluorocarbon/methylene

chloride azeotropes or mixtures, which attack the indicator

adhesive, repeat the above steps, but with two vials of each

sample. Cut the bottom two color squares off three ‘‘color-

pHast’’® sticks and discard the remainder of the stick. Put

one square of each color in samples from 5.1, 5.2, and 5.3

sources and complete steps 5.4 through 5.7.

5.9

Interpretation of Results

pH is above 5.5, this is an

acceptable condition. If pH is less than 5.5, the solvent is

contaminated by an accumulation of activated flux residues,

organic acids, or thermal degradation products of the solvent.

This requires inspection to establish the need for cleaning of

the equipment and for recovery of the solvent.

2215

Sanders Road

Northbrook, IL 60062-6135

IPC-TM-650

TEST

METHODS MANUAL

Number

2.3.30

Subject

Solvent

pH Determination in Anhydrous

Fluorocarbons Solvents

Date

11/81

Revision

Originating Task Group

N/A

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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Scope

This

test method is designed to determine the

removal effect the flux has (if any) on the bright copper mirror

film which has been vacuum deposited on clear glass.

2 Applicable Documents

IPC J-STD-004

Requirements

for Soldering Fluxes

ASTM

E104

Maintaining

Constant Relative Humidity by

means of Aqueous Solutions

Federal

Speciﬁcation LLL-R-626

Rosin,

Gum, Rosin Wood

and Rosin Tall Oil

Test Specimen

minimum of 10 ml of liquid flux, a rep-

resentative container of solder paste, dissolved paste flux,

extracted solder preform flux or extracted cored wire flux. The

reflow/extraction process should be carried out in accordance

with J-STD-004.

Apparatus and Reagents

4.1

Control

standard rosin flux, class A, type II, grade WW,

of Federal Specification LLL-R-626.

4.2

Reagent

grade (99% pure) 2-propanol.

4.3

Copper

Mirrors (see 6.2 and 6.3).

4.4

500

ml of reagent grade 0.5% solution of ethylene

diamine tetra acetic acid (EDTA).

4.5 Reagent

grade ethanol or methanol.

4.6

Deionized

water with a resistivity of at least 18.0

megohm centimeter.

4.7

Glass

dropper.

4.8

Test

cabinet capable of achieving 23 ± 3 °C [73.4 ±

5.4 °F] and 50 ± 5% relative humidity.

4.9

relative humidity gauge havinga±2%accuracy, or

better, shall be used to continuously monitor the test environ-

ment. The gauge should be calibrated periodically.

Procedures

5.1 Preparation

5.1.1 Control Standard Flux

Dissolve

35 g of Federal

Specification LLL-R-626 rosin into 100 ml of reagent grade

(99% pure) 2-propanol and stir thoroughly.

5.1.2

Temperature/Humidity Chamber

When

acid or salt

solutions (such as reported in ASTM E104) are used, the envi-

ronment shall be monitored for a minimum of 48 hours prior

to exposing the copper mirror samples, to assure compliance

with the 50% ± 5% relative humidity requirement.

5.1.3

Copper Mirror Test Panels

5.1.3.1

Immediately

before testing, immerse the copper mir-

ror in a 5 g/l solution of EDTA for one minute for copper oxide

removal. Mirrors stored in a nonoxidizing environment do not

require cleaning with the EDTA solution prior to testing. The

cleaning step must be used if test results are in dispute.

5.1.3.2

Rinse

the mirror thoroughly in running deionized

water, immerse in clean ethanol or methanol, and dry with

clean, oil free air.

5.1.3.3

Carefully

examine the mirror before testing. There

must be no oxide.

5.2

Test

5.2.1

Place

the copper mirror test panel on a flat surface,

mirror side up, and protect from dust and dirt at all times.

5.2.2

Place

one drop of test flux or extract to be tested

(approximately 0.05 ml) on the copper mirror test panel. Do

not allow the dropper to touch the test panel.

5.2.3 Apply

solder paste directly to the mirror without

scratching the copper surface. Use a volume approximating

0.5 mm [0.197 in] thickness and 8.0 mm [0.350 in] diameter.

(It has been determined that significant variations from this

quantity have little effect for most materials.)

2215

Sanders Road

Northbrook, IL 60062-6135

IPC-TM-650

TEST

METHODS MANUAL

Number

2.3.32

Subject

Flux

Induced Corrosion (Copper Mirror Method)

Date

06/04

Revision

Originating Task Group

Flux Specification 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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5.2.4

Immediately

also place one drop of the control stan-

dard flux adjacent to the test flux. Do not allow the drops to

touch.

5.2.5

Place

the test panel in a horizontal position in the dust

free cabinet at 23 ± 2 °C [73.4 ± 3.6 °F] and 50 ± 5% relative

humidity for 24 ± 1/2 hours.

5.2.6 At

the end of the 24 hour period, remove the test

panel and remove the test flux and control standard flux by

immersion in clean 2-propanol.

5.3

Evaluation

5.3.1

Carefully

examine the test panel for possible copper

removal or discoloration.

5.3.2

See

J-STD-004 for evaluation criteria.

5.3.3

the control flux fails the L category, repeat the entire

test using a new copper mirror test panel.

5.3.4

Discoloration

of the copper film due to a superficial

reaction or only a partial reduction of the copper film thickness

is not considered a failure.

5.3.5

number of chemicals can cause failure of copper

mirror: free halides, stronger organic and inorganic acids and

free amines.

Notes

6.1 Safety

Observe all appropriate precautions on MSDS

for chemicals involved in this test method.

6.2

Preparation of Copper Mirrors

6.2.1

Apply,

by vacuum deposition, a film of copper metal

on one surface of a flat sheet of clear, polished glass.

6.2.2

Apply

a uniform thickness of approximately 50 nm,

and assure that the finished mirror permits 10 ± 5% transmis-

sion of normal incident light of nominal wave length of 500

nm. This may be determined using a suitable photoelectric

spectrophotometer.

6.2.3

Prevent

oxidation of the copper mirror by storing in a

closed container which has been flushed with nitrogen.

IPC-TM-650

Number

2.3.32

Subject

Flux

Induced Corrosion (Copper Mirror Method)

Date

06/04

Revision

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