IPC-TM-650 EN 2022 试验方法.pdf - 第145页

Where: V is the volume, in ml, of alkali used (tetrabutyl ammonium hydroxide for Method A, potassium hydroxide for Method B). M is the molarity of the alkali used. m is the mass, in grams, of the sample taken. S is the p…

4.3.5

Potassium

hydroxide solution, 0.1 M in alcohol. Use a

commercially available standard solution or one prepared from

a commercially available concentrated standard solution by

dilution with ethanol (4.3.1). Alternatively, prepare an approxi-

mate 0.1 M potassium hydroxide solution by dissolving 3 ±

0.1 g potassium hydroxide (KOH) in 500 ml of ethanol (4.3.1),

and standardize this solution against an accurately weighed

amount of benzoic acid (about 0.5 g) dissolved in ethanol

(4.3.1).

4.3.6

Phenolphthalein

indicator solution. Add 1g of phenol-

phthalein to approximately 50 ml methanol and mix. When

dissolved, dilute to 100 ml with methanol and mix.

Procedures

5.1 Potentiometric Titration (Method A)

5.1.1

preliminary experiments, determine whether the

sample is soluble in 2-propanol, anhydrous ethanol, toluene or

the ethanol/toluene mixture. If the sample is not completely

soluble in any of these solvents, select the one in which the

sample appears to be the most soluble. If the sample is

equally soluble in all four solvents, then use neutralized

2-propanol (4.2.2).

5.1.2

Carry

out the following procedure, in triplicate, on the

flux sample.

5.1.2.1

Weigh, to the nearest 0.001 g, 2 to5goftheliquid

flux sample, taking steps to prevent loss of volatile matter

during the weighing. The larger size (≈5 g) sample is required

for very low solids fluxes. Transfer the weighed sample to a

250 ml low form beaker.

5.1.2.2 Dilute

the sample to 100 ml with 2-propanol (4.2.2),

or the selected solvent (4.2.3 to 4.2.5), according to the solu-

bility characteristics of the flux. Cover with a watch glass and

dissolve the flux by gentle agitation.

5.1.2.3

Place

the beaker on the stand of the titration assem-

bly with the electrodes, stirrer and burette in position. Adjust

the speed of the stirrer to give vigorous stirring without splash-

ing. Titrate with the 0.1 M tetrabutyl ammonium hydroxide

solution (4.2.1), adding 1.0 ml portions and recording the pH

or mV meter reading after each addition. As the end-point is

approached, reduce the additions of titrant to 0.1 ml and con-

tinue titrating past the end-point.

5.1.2.4

Plot

the pH or potential values against the volume of

titrant added to obtain the titration curve. The point of inflec-

tion of the curve corresponds to the end-point of the titration.

Note: The point of inflection of the curve may conveniently be

determined by using the derivative curve.

5.1.2.5

Carry out a blank determination, using reagents

only, for comparison purposes.

5.2

Visual Titration (Method B)

5.2.1

preliminary experiments, determine whether the

sample is soluble in 2-propanol, anhydrous ethanol, toluene or

the ethanol/toluene mixture. If the sample is not completely

soluble in any of these solvents, select the one in which the

sample appears to be the most soluble. If the sample is

equally soluble in all four solvents, then use neutralized etha-

nol (4.3.1) as the selected solvent.

5.2.2

Carry

out the following procedure, in triplicate, on the

flux sample.

5.2.2.1

Weigh,

to the nearest 0.001 g, sufficient flux sample

to correspond to approximately1gofnonvolatile matter (see

IPC-TM-650, Test Method 2.3.34), taking steps in the case of

liquid flux samples to prevent loss of volatile matter during the

weighing.

5.2.2.2

Transfer

the weighed sample to a suitable flask or

beaker and add 100 ml of the selected solvent. Stir until the

sample has dissolved as completely as possible. Do not heat.

5.2.2.3

Add

three drops of phenolphthalein indicator solu-

tion (4.3.6) and titrate with the 0.1 M potassium hydroxide

solution (4.3.5) until a faint pink color persists throughout the

titrated solution for 15 seconds.

5.2.2.4

Carry

out a blank determination, using reagents

only, for comparison purposes.

5.3

Calculation of Results

The

acid value is expressed in

milligrams of potassium hydroxide per gram of nonvolatile

matter, regardless of the alkali used to perform the titration.

5.3.1

The

acid value (expressed in milligrams of potassium

hydroxide per gram of nonvolatile matter) is given by:

56.11VM

IPC-TM-650

Number

2.3.13

Subject

Determination

of Acid Value of Liquid Solder Flux -

Potentiometric and Visual Titration Methods

Date

06/04

Revision

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Where:

is the volume, in ml, of alkali used (tetrabutyl ammonium

hydroxide for Method A, potassium hydroxide for Method B).

M is the molarity of the alkali used.

m is the mass, in grams, of the sample taken.

S is the percentage nonvolatile matter, expressed as a frac-

tion, determined as described in IPC-TM-650, Test Method

2.3.34.

5.3.2

The

acid value of the flux under test is calculated as

the mean of the results obtained on each of the three test

samples.

Notes

6.1 Safety

Observe

all appropriate precautions on MSDS

for chemicals involved in this test method.

IPC-TM-650

Number

2.3.13

Subject

Determination

of Acid Value of Liquid Solder Flux -

Potentiometric and Visual Titration Methods

Date

06/04

Revision

age3of3

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Scope

This

test method provides a standard method for

evaluating the effect of established processing operations

used in the manufacture of PWBs on materials that are con-

sidered for use in the manufacture of PWBs. Specific criteria

for the acceptability are based on copper foil adhesion and

visual surface condition of the base laminate.

Applicable Documents

IPC-TM-650 Test Methods Manual

2.4.8

Peel Strength of Metallic Clad Laminates

MIL-P-13949

Test Specimens

3.1

Copper-clad

epoxy glass laminate materials ranging

from 0.8 mm to 6.5 mm thick, clad on one or both sides.

3.2

Three

specimens shall be tested from each material,

except in the case where the material is clad on both sides,

and then six specimens shall be processed for each material.

Each specimen will have four readings for peel strength (see

IPC-TM-650, Method 2.4.8).

Equipment/Apparatus

4.1 Etching

Typical

production printing, etching, and plat-

ing equipment and materials

4.2

Tester

For

peel strength equipment (see IPC-TM-650,

Method 2.4.8)

Procedure

5.1 Print and Etch

5.1.1

Sand

the edges of the test specimens to remove

burrs, allowing close contact between the specimen, nega-

tive, and frame glass, resulting in a better defined etched pat-

tern.

5.1.2 Scrub

the copper surface(s) with FFF pumice and a

brush to remove any contamination on the surface of the

specimen until it passes a water break test.

5.1.3

Dry

the specimens using compressed filtered air.

5.1.4

Dip

the specimens in the following photoresist solution

at room temperature:

One part by volume KPR III

One part by volume toluene

One part by volume acetone

The specific gravity of the solution is 0.920.

5.1.5

Hold

the specimen by one corner when dipping. Allow

excess solution to drain until dripping stops.

5.1.6

Put

the specimens on rack (after draining) into 80°C

oven from three to five minutes to dry and harden KPR.

5.1.7

Remove

the rack from the oven and allow the speci-

mens to cool to room temperature.

5.1.8

Place

the specimens upon the negative in the printing

frame with the copper side against the negative.

5.1.9

Expose

the mounted specimen 76 mm from the fluo-

rescent black light for seven minutes.

5.1.10

Develop

in trichlorethylene vapor for 15 seconds. It

may require two to six cycles until the pattern is clear. Air-dry

the specimen after developing.

Note: Use the test pattern in Method 2.4.8.

5.2

Etching Process and Etchant Removal

5.2.1 Method A

5.2.1.1

Etch

the specimens with vigorous aeration for the

minimum time (the time to produce a clean pattern with a

minimum of undercutting is approximately seven minutes for

34 mm and 15 minutes for 69 mm copper, using fresh ferric

chloride solution) in 42° Baume (be) ferric chloride solution

maintained at 24°C to 38°C. The etching solution shall be

renewed when the etching time exceeds 15 minutes for 34

mm copper or 30 minutes for 69 mm copper.

5.2.1.2

After

removal of the copper, immediately wash the

specimens with running tap water at 16°C to 32°C for two to

five minutes. Thereafter, keep the specimens from drying until

reaching step 5.2.1.7.

The

Institute for Interconnecting and Packaging Electronic Circuits

2215 Sanders Road • Northbrook, IL 60062-6135

IPC-TM-650

TEST

METHODS MANUAL

Number

2.3.14

Subject

Print,

Etch, and Plate Test

Date

4/73

Revision

Originating Task Group

N/A

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.

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