IPC-TM-650 EN 2022 试验方法.pdf - 第167页

6.0 Notes 6.1 Preventative Maintenance, Troubleshooting 6.1.1 Depending upon the bath chemistry as analyzed, con- dition of the panel relative to uniformity, burning, cloud pat- terns skip plate, etc., modification by co…

5.1.3

Cold

water rinse.

5.1.4

Wipe

surface with Hull Cell sponge that has been

soaked in D.I. water.

5.1.5

Observe

panel for water break free condition. Repeat

5.1.4 and 5.1.5 as necessary.

5.1.6

For

plastic coated brass panels-remove plastic film by

peeling it off.

5.1.7

Soak

in mild soak cleaner.

5.1.8 Reserve

current clean at 2 amps for one minute.

5.1.9

Cold

water rinse.

5.1.10

Acid

dip 10% C.P. Hydrochloric Acid for 5 seconds.

5.1.11

Cold

water rinse.

5.1.12

Observe

for water break free surface; repeat steps

5.1.7 through 5.2.11 if necessary.

5.2

Test

Insert

cathode test panel along the slanted side of

the Hull Cell (it just fits), which has solution to scribed line.

5.2.1

Hook

red cable to anode (+).

5.2.2

Hook

black cable to cathode (–).

5.2.3

Set

timer to prescribed time (see tech bulletin).

5.2.4

Turn

on power source.

5.2.5

Adjust

power to described amperage.

5.2.6

Start

time.

5.2.7 At

prescribed time, shut off power.

5.2.8

Disconnect

cathode cable.

5.2.9

Remove

cathode panel.

5.2.10

Cold

water rinse.

5.2.11

Complete

desired post plate treatment if any-

example: dipping panel in 1/4 to 1/2 of 1% by volume. Nitric

Acid (C.P. Grade) for 3-5 seconds enhances the ability to

interpret the panel on zinc and cadmium plating solutions.

5.2.12

Warm

Water Rinse.

5.2.13

Dry, forced air or even wiping with a water absorbent

paper towel.

5.2.14

alternate method of drying the panels is to water

rinse followed by an alcohol rinse to drive off the water. Also,

a method of preserving samples is to spray them immediately

with a clear lacquer to prevent oxidation.

5.3

Evaluation

5.3.1

See

Bulletin ‘‘The Hull Cell’’ or proprietors data sheets

utilizing the Hull Cell Scale appropriate for the amperage used

as the guide to current densities.

5.3.2 Hull

Scale use: place the bottom edge of the ‘‘as

plated’’ on the line that matches the amperage plating was

performed. The areas on the panel above these numbers are

the area of that number’s current density.

IPC-2321-1

Figure

1 Hull Cell Hook Up

IPC-TM-650

Number

2.3.21

Subject

Plating

Quality Hull Cell Method

Date

8/97

Revision

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6.0 Notes

6.1

Preventative Maintenance, Troubleshooting

6.1.1

Depending

upon the bath chemistry as analyzed, con-

dition of the panel relative to uniformity, burning, cloud pat-

terns skip plate, etc., modification by controlled additions can

be made to the Hull Cell plating solution and procedures can

be repeated. Changes caused by addition to the Hull Cell will

duplicate results to be expected by the same proportionate

additions to the main plating bath.

6.1.2 Correlations

of thickness checks in the controlled

time, temperature, amperage cathode panel will also tell the

optimum plating range to obtain plating thickness desired.

6.1.3

Source of applicable documents:

R.O.

Hull and Co., Inc.

3203 W. 71st

Cleveland, OH 44102

IPC-TM-650

Number

2.3.21

Subject

Plating

Quality Hull Cell Method

Date

8/97

Revision

age3of3

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Scope

This

test method is used to determine the pres-

ence and effectiveness of the protective coating deposited

over the PWB to prevent oxidation and facilitate good wetting

during soldering operations. The coating is removed during

soldering.

Applicable Documents

None

Test Specimens

3.1

Any

pre-production or production copper clad board at

least 5 cm x 5 cm. The specimen must either contain circuitry

or be completely copper clad. An uncoated bare copper clad

specimen must also be available for control purposes.

Equipment/Apparatus

4.1

Reagent

or commercial grade ferric chloride (42BE’)

etchant

4.2

Petrie

dishes or glass trays

4.3

Stop

watch

4.4

Lint-free

cloth

5 Procedure

5.1 Test

5.1.1

Place

one drop of ferric chloride on several locations

on the test specimens and the bare copper control speci-

mens.

5.1.2

Allow

to stand 10 seconds, then rinse with tap water

and wipe dry.

5.2

Evaluation

5.2.1

Examine

specimens and compare with bare control

specimen. Test specimens must show no copper etching,

proving the presence and effectiveness of protective coating.

Note

Slight

‘‘mottling’’ or a slight attack on the coated

surface indicates uneven deposition or insufficient solids of the

coating.

The

Institute for Interconnecting and Packaging Electronic Circuits

2215 Sanders Road • Northbrook, IL 60062-6135

IPC-TM-650

TEST

METHODS MANUAL

Number

2.3.22

Subject

Copper

Protective Coating Quality

Date

2/78

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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