IEC 62739-3:2017

Test method for erosion of wave soldering equipment using molten lead-free solder alloy - Part 3: Selection guidance of erosion test methods

IEC 62739-3:2017 describes the selection methodology of an appropriate evaluating test method for the erosion of the metal materials without or with surface processing intended to be used for lead-free wave soldering equipment as a solder bath and other components which are in contact with the molten solder.

Méthode d'essai de l'érosion de l'équipement de brasage à la vague utilisant un alliage à braser sans plomb fondu - Partie 3 : Recommandations pour la sélection des méthodes d’essai d’érosion

L’IEC 62739-3:2017 décrit la méthodologie de sélection d’une méthode d'essai appropriée pour évaluer l'érosion des matériaux métalliques sans ou avec traitement de surface, destinés à être utilisés comme bain de brasure pour les équipements de brasage à la vague sans plomb, ainsi que l'érosion d'autres composants qui entrent en contact avec la brasure fondue.

General Information

• Status: Published
• Publication Date: 05-Jan-2017
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 31.190 - Electronic component assemblies
• ICS: 31.240 - Mechanical structures for electronic equipment
• ICS: 31.260 - Optoelectronics. Laser equipment
• Technical Committee: TC 91 - Electronics assembly technology
• Drafting Committee: WG 3 - TC 91/WG 3
• Current Stage: PPUB - Publication issued
• Start Date: 18-Jan-2017
• Completion Date: 06-Jan-2017

Standards Content (Sample)

IEC 62739-3 ®
Edition 1.0 2017-01
INTERNATIONAL
STANDARD
Test method for erosion of wave soldering equipment using molten lead-free
solder alloy –
Part 3: Selection guidance of erosion test methods

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
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International Standards for all electrical, electronic and related technologies.

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IEC 62739-3 ®
Edition 1.0 2017-01
INTERNATIONAL
STANDARD
Test method for erosion of wave soldering equipment using molten lead-free

solder alloy –
Part 3: Selection guidance of erosion test methods

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 31.190; 31.240 ISBN 978-2-8322-3769-4

– 2 – IEC 62739-3:2017 © IEC 2017
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 General remarks . 7
5 Selection of the appropriate erosion test method . 8
5.1 Correlation between test methods and stresses induced in the field . 8
5.2 Recommended test method by materials . 9
6 Common items for each test method . 10
6.1 Specimen preparation . 10
6.2 Solder alloy . 10
6.3 Accelerated stress conditions. 10
6.3.1 Test temperature . 10
6.3.2 Rotation speed . 10
6.3.3 Bending stress to the specimen . 11
6.4 Dross . 11
6.4.1 Dross generation and removal interval . 11
6.4.2 Dross removal method . 11
6.4.3 Molten solder volume after dross removal . 11
6.5 Erosion depth measurement method . 11
6.5.1 Post test treatment . 11
6.5.2 Local erosion depth . 12
6.5.3 General (uniform) erosion depth . 13
6.5.4 Evaluation . 14
7 Overview of the test methods . 14
7.1 Test methods . 14
7.2 Metal material without surface processing . 14
7.2.1 General . 14
7.2.2 Rotation test at 350 °C . 15
7.3 Metal material with surface processing. 16
7.3.1 Test method . 16
7.3.2 Rotation test at 450 °C . 16
7.3.3 Rotation test at 450 °C with 2 mm bending . 17
Annex A (informative) Selection of test temperature, test duration and bending stress . 18
A.1 Specimen without surface processing . 18
A.2 Specimen with surface processing . 20
Annex B (informative) Maximum depth and other measurements . 23
B.1 General . 23
B.2 Maximum depth measurement . 23
Annex C (informative) Erosion mechanism . 26
C.1 Specimen without surface processing . 26
C.2 Specimen with surface processing . 26
C.3 Further guidance . 27
Annex D (informative) Thermal acceleration for erosion . 28
D.1 Specimen without surface processing . 28
D.2 Specimen with surface processing . 28

D.3 Further guidance document . 30
Bibliography . 31

Figure 1 – Schematic example of wave soldering equipment . 8
Figure 2 – Example of dross removal tool . 11
Figure 3 – Schematic general definition of erosion depth . 12
Figure 4 – Schematic definition of erosion depth by focal depth method . 12
Figure 5 – Examples of local erosion . 13
Figure 6 – Example of evaluation region . 13
Figure 7 – Examples with non-erosion area . 14
Figure 8 – Examples without a non-erosion area and an example of a cross section . 14
Figure 9 – Configuration example of test equipment. 15
Figure 10 – Configuration example of test equipment for rotation test at 450 °C with 2
mm bending . 17
Figure A.1 – Specimen configuration for preliminary test . 18
Figure A.2 – Erosion depth against molten solder temperature . 19
Figure A.3 – Erosion depth against rotation speed . 19
Figure A.4 – Erosion depth against immersion time . 20
Figure C.1 – Erosion mechanism for material with nitriding . 27
Figure D.1 – Tin (Sn) diffusion layer growth in the plasma nitriding layer for various
stainless steel . 29

Table 1 – Location of erosion in the field and examples of problems . 8
Table 2 – Correlation between test methods and stresses induced in the field . 9
Table 3 – Applicable test method depending on the materials . 9
Table 4 – Test conditions for rotation test at 350 °C . 16
Table 5 – Test conditions for rotation test at 350 °C . 16
Table A.1 – Erosion test results for the materials of gas nitriding and nitrocarburizing . 21
Table A.2 – Erosion test results for the materials of coating type surface processing . 22
Table B.1 – Measurement methods, features and accuracy. 24
Table B.2 – Example of measurement equipment. 25
Table D.1 – Plasma nitriding layer peeling off period (incubation period in Figure D.1) . 29
Table D.2 – Initial growth rate for tin (Sn) diffusion layer . 30

– 4 – IEC 62739-3:2017 © IEC 2017
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
TEST METHOD FOR EROSION OF WAVE SOLDERING
EQUIPMENT USING MOLTEN LEAD-FREE SOLDER ALLOY –

Part 3: Selection guidance of erosion test methods

FOREWORD
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...

IEC 62739-3 ®
Edition 1.0 2017-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Test method for erosion of wave soldering equipment using molten lead-free
solder alloy –
Part 3: Selection guidance of erosion test methods

Méthode d'essai de l'érosion de l'équipement de brasage à la vague utilisant
un alliage à braser sans plomb fondu –
Partie 3: Recommandations pour la sélection des méthodes d’essai d’érosion

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
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International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.

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IEC 62739-3 ®
Edition 1.0 2017-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Test method for erosion of wave soldering equipment using molten lead-free

solder alloy –
Part 3: Selection guidance of erosion test methods

Méthode d'essai de l'érosion de l'équipement de brasage à la vague utilisant

un alliage à braser sans plomb fondu –

Partie 3: Recommandations pour la sélection des méthodes d’essai d’érosion

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 31.190; 31.240 ISBN 978-2-8322-8096-6

– 2 – IEC 62739-3:2017 © IEC 2017
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 General remarks . 7
5 Selection of the appropriate erosion test method . 8
5.1 Correlation between test methods and stresses induced in the field . 8
5.2 Recommended test method by materials . 9
6 Common items for each test method . 10
6.1 Specimen preparation . 10
6.2 Solder alloy . 10
6.3 Accelerated stress conditions. 10
6.3.1 Test temperature . 10
6.3.2 Rotation speed . 10
6.3.3 Bending stress to the specimen . 11
6.4 Dross . 11
6.4.1 Dross generation and removal interval . 11
6.4.2 Dross removal method . 11
6.4.3 Molten solder volume after dross removal . 11
6.5 Erosion depth measurement method . 11
6.5.1 Post test treatment . 11
6.5.2 Local erosion depth . 12
6.5.3 General (uniform) erosion depth . 13
6.5.4 Evaluation . 14
7 Overview of the test methods . 14
7.1 Test methods . 14
7.2 Metal material without surface processing . 14
7.2.1 General . 14
7.2.2 Rotation test at 350 °C . 15
7.3 Metal material with surface processing. 16
7.3.1 Test method . 16
7.3.2 Rotation test at 450 °C . 16
7.3.3 Rotation test at 450 °C with 2 mm bending . 17
Annex A (informative) Selection of test temperature, test duration and bending stress . 18
A.1 Specimen without surface processing . 18
A.2 Specimen with surface processing . 20
Annex B (informative) Maximum depth and other measurements . 23
B.1 General . 23
B.2 Maximum depth measurement . 23
Annex C (informative) Erosion mechanism . 26
C.1 Specimen without surface processing . 26
C.2 Specimen with surface processing . 26
C.3 Further guidance . 27
Annex D (informative) Thermal acceleration for erosion . 28
D.1 Specimen without surface processing . 28
D.2 Specimen with surface processing . 28

D.3 Further guidance document . 30
Bibliography . 31

Figure 1 – Schematic example of wave soldering equipment . 8
Figure 2 – Example of dross removal tool . 11
Figure 3 – Schematic general definition of erosion depth . 12
Figure 4 – Schematic definition of erosion depth by focal depth method . 12
Figure 5 – Examples of local erosion . 13
Figure 6 – Example of evaluation region . 13
Figure 7 – Examples with non-erosion area . 14
Figure 8 – Examples without a non-erosion area and an example of a cross section . 14
Figure 9 – Configuration example of test equipment. 15
Figure 10 – Configuration example of test equipment for rotation test at 450 °C with 2

mm bending . 17
Figure A.1 – Specimen configuration for preliminary test . 18
Figure A.2 – Erosion depth against molten solder temperature . 19
Figure A.3 – Erosion depth against rotation speed . 19
Figure A.4 – Erosion depth against immersion time . 20
Figure C.1 – Erosion mechanism for material with nitriding . 27
Figure D.1 – Tin (Sn) diffusion layer growth in the plasma nitriding layer for various
stainless steel . 29

Table 1 – Location of erosion in the field and examples of problems . 8
Table 2 – Correlation between test methods and stresses induced in the field . 9
Table 3 – Applicable test method depending on the materials . 9
Table 4 – Test conditions for rotation test at 350 °C . 16
Table 5 – Test conditions for rotation test at 350 °C . 16
Table A.1 – Erosion test results for the materials of gas nitriding and
...