Bsi bs en 12373 4 1999 scan

STD BSI BS EN 12373 4 ENGL 1999 Lb24bb9 0781718 O73 = BRITISH STANDARD Aluminium and aluminium alloys Anodizing Part 4 Estimation of loss of absorptive power of anodic oxidation coatings after sealing[.]

S T D - B S I BS EN 12373-4-ENGL 1999 L b 2 4 b b 9 0781718 O73 =

BRITISH STANDARD

Aluminium and

Part 4: Estimation of loss of absorptive

treatment

British Standard

ICs 25.220.20,77.120.10

NO COPYING WITHOUT BSI PERMISSION EXCEPT As PERMITTED BY COPYRIGHT LAW

BS EN

1237341999

BS EN 1237341999

Date

National foreword

Text affected

This British Standard is the English language version of EN 1237341998 It

The UK participation in its preparation was entrusted to Technicai Committee

- aid enquirers to understand the t e a

- present to the responsible European committee any enquiries on the

- monitor related international and European developments and promulgate interpretation, or proposals for change, and keep the UK interests inform@

them in the UK

A list of organizations represented on this committee can be obtained on request to

its secretary

Cross-references

The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entithi “Intemationai Standards Correspondence Index”, or by ushg the

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Summary of pages

This document comprises a front cover, an inside front cover, the EN titie page, pages 2 to 5 and a back cover

i This British Standard, having Amendments issued since publication

been prepared under the

diredion of the Sector

Committee for Materials and

Chemicals, was published under

the authority of the Standards

Committee and comes into effect

on 15 Aprii 1999

Amd No

ISBN O 680 32030 8

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EUROPEAN m m

NORME EUROPÉENNE

EUROPm€E NORM

EN 123734

November 1998

ICs 25.220.20; 77.120.10

Descriptois: surface treatment, anodizing, aluminium, aluminium alloys, sealing, absorption factor, chemical tests, dyes

English version

Aluminium and aluminiwn alloys - An

Part 4 Esthution of loss of absorptive power of anodic oxidation

coatings after sealmg by dye spot test with prior acid tmdment

Aluminium et ailiages d'aiuminium -

Anodidon - Partie 4 Appréciation de la perte du

pouvoir absorbant des couches d'owdes anodiques

par essai a la goutte de colorant avec action acide

Aluminium und Aluminiumlegierungen -

Anodisienm - TU4 Abs&&mg der Anfärbbarkeit von modisch emugten oladschichten nach dem Verdichten durch

This European Standard was approved by CEN on 5 November 1998

CEN members are bound to comply with the CENKENELEC Internai Regulations which stipuiak the conditions for giving this European Standard the status of a national standard without any alteration UptoCiate lists and bibliographicai references concerning such national standards may be obtained on application to

the Centrai Secretariat or to any CEN member

This European Standard exists in three official versions (Engüsh, French, German)

A version in any other language made by transialion under the responsibility of a CEN member into its own language and notified to the Centrai Secretariat has the same status as the official versions

CEN members are the national standards bodies of A ~ ~ t r i a , Belgium, Czech Republic, Denmark, Fuiland, France, Germany, Greece, Iceland, Ireland, Itaiy, Luxembourg, Netherlands, Norway, Portugai, Spain, Sweden, Switzerland and

United Kingdom

CEN

European Committee for Standardization Comitk Européen de Nonnalisation Europäisches Komitee fûr Normung

Central Secretariat: rue de Stassart 36, B-1050 Brussels

-

O 1998 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members

Ref No EN 1237341998 E

S T D - B S I BS EN 32373-9-ENGL 3 9 9 9 Lbi2qbbS 0 7 8 3 7 2 3 bb8

Page 2

EN 1237341998

Foreword

This European Standard has been prepared by

Techniai Committee CENR% 132, Aluminium and

aluminium aiioys, the Secretariat of which is held by

AFNOR

This European Standard shall be given the status of a

national standard, either by publication of an identical

text or by endorsement, at the latest by May 1999, and

conflicting national standards shall be withdram at

the latest by May 1999

According to the CENKENELEC Internal Regulations,

the national standards organizations of the foliowing

countries are bound to implement this European

Standank Austria, Belgium, Czech Republic, Denmark,

Finland, France, Germany, Greece, I c e h d , I r e h d ,

My, Luxembourg, Netherlands, Norway, Portugal,

Spain, Sweden, Switzerland and the United Kingdom

It is based upon IS0 2143A981

in this standard, annexA is normative

EN 12373, Aluminium and aluminium alloys -

Anodizing, comprises the following parts:

- Part 1: Methal for spea&ìng decomtive and

protective anodic oxidation coatings on

aluminium;

- Part 2Detaminution of mass per unit area

( m @ ì density] of anodic oxidation coatings -

Gravimet!rìcmethod;

-Part 3: Determination of th- of anodic

oxidation coatings - NmdescruCtive measurement

by splihbeam m i c m s q e ;

- Part 4: Estimation of loss of absvrptiw power of

anodic oxidation coatings qfkr seaJing by dye spot

test with pìm acid macment;

- Part 5: Assessment of quality of sealed anodic

oxidation coatings by mecisurement of admittance;

-Part 6: Assessment of quality of sealed anodic

oxidation coatings by m e a s u m t of the loss of

mass clfterimmersion in phosphoric acid/chmmic

acid solutùrn without prior acid mat?nent;

- Part E Assessment of quality of sealed anodic

oxidation coatings by measurement of the loss of

mass a m immersion in p h s p h d c W c h m m i c

acid solution with pìm acid treatment;

- Part 8: Determination of the m p a m t i v e

fastness to ultra-zvidet light and heat of coloured

anodic oxidation coatings;

- Part 9: M e m m t of wear resistance and

wear index of anodic oxìùat.iOn coatings using an

abrasive wheel wear test appamtus;

- Part 10: Measurement of w a n spec@ïc alwasion

resistance of anodic oxidation coatings usàng an abmsive jet test appamtus;

- Part 11: Measurement of specular m$!echm and

sp&r gloss of anodic oxidation coatings at

a n g k of2@, 45”,6@ ~ 8 s “ ;

-Part 12: M e a s u m t of mmtance

chumteristics of aluminium s u @ ì usàng integmting-sphere instmLmats;

-Part 13: M e a s u m t of wfictivity chamteristics of aluminium su@mes using a

gonùyphotometer or an abridged gmùyphtometer; -Part 14: V W determination of image clamtg of anodic oxidatùm coatings - chart scale method;

- Part 15: Assessrnent of resistance of anodic oxidation coatings to cmcking by à e f m t i o n ;

- Part 16: Check for continuity of thin anodic

oxidation coatings - Copper su&ate test;

- Part 1 E Determinution of eìecwic tmxkùmm

potential;

- Part 18: Rating sgstem for the a>alwl>tion of

pitting corrosion- chart method;

-Part 19: Rating system for the evaluation of

pittiw m s ù m - Gmd method

Contents

Foreword Introduction

1 Scope

2 Principle

3 Reagents

4 Testspecimens

5 procedure

6 Expression of results

7 Testreport

Annex A (normative) interpretation of the results of the dye spot test

page

2

3

3

3

3

3

3

3

4

6

O BSI 04-1999

S T D - B S I BS EN 12373-'4-ENGL 1777 m LbZLibbS 0 7 8 1 7 2 2 STq m

Introduction

The resistance of anodic oxidation coatings to the

absorption of dyes can give information on the quality

of sealing, total resistance indicating that the quality of

sealing is good Slight loss of resistance to absorption,

however, does not necessarily mean that the sealing of

the coating is poor; it may be a consequence of certain

agents having been added to the seaiing bath In cases

of doubt, the quality of sealing can be established

using a reference method such as that described in

EN 12373-6l) or EN 123737l)

1 scope

This part of this European standard specifies a method

of athating the loss of absorptive power of anodic

oxidation coatings that have undergone a sealing

treatment, by dye absorption after acid pretreatment

The method is suitable for use as a production control

method and is applicable to anodic oxidation coatings

which may be subjected to weathering or aggresive

environments, or where resistance to sîaining is

important

The method is not applicable to coatings that

a) are formed on alloys containing more than 2 %

copper or 4 % silicon;

b) are sealed by the dichromate process;

c) have been given supplementary processing;

for example, oiling, waxing or lacquering;

d) are coloured in deep shades;

e) are less than 3 cl.m thick

The method is less appropriate where nickel or cobalt

salts, or organic aàdiüves, have been added to the

seaìing bath

2 Principle

A degreased area of sample is subjected to the action

of an acid and the coloration obtained after the

subsequent application of a dyestuff is observed

3 Reagents

3.1 General

Use only reagents of recognized analyticai grade and

distilled water, or water of equivaìent purity The acid

solutions specified in 3.2.1 and 3.2.2 may be used

e q m y for either dye spot test, but the acid solution

specified in 3.2.2 is preferred for safety reasons

3.2 Acid solutions

WARNING NOTE These acid solutions contain

hydrofluoric acid, and should be stored in appropriate

containers and handled with care

Page 3

EN 1237341998

sulfuric acid Cp20 = 1,84 gíml) and 10 g of potassium fluoride per litre

fluorosilicic acid ( H 2 s i 6 ) Cp20 = 1,29 g h l ) per litre

3.3 Dye solutions

of Sanodai Blue 2LW (Colour Index Mordant Blue 69)

per iitre, at$usted, at approximately 23 O C , to a pH

of 5,O * 0,5 with dilute sulfuric acid solution or with dilute sodium hydroxide solution

of Sanodai Red EBLW (Colour Index Acid Red 331) per

litre, adjusted, at approximately 23 O C , to a pH

of 5,7 * 0,5 with dilute sulfuric acid solution or with

dilute sodium hydroxide solution

4 Test specimens

The test shall nomially be carried out using production articles

NOTE The use of specially prepared test specimens, processed at

the same time and in the same manner as production articles, can lead to emneous resuits

5 Procedure

Clean the surface to be tested, removing any grease with a piece of cotton wool soaked in, e.g., acetone or ethanol 96 % (VIV)

Apply one drop of acid solutionA (3.2.1) or acid solution B (3.2.2), at approximately 23 OC, to the

horizontal, clean, dry surface, and ailow to remain for 60 s

Remove the drop of acid solution, and wash and dry

the test surface

Apply one drop of dye solutionA (3.3.1) or dye solution B (3.3.2) to the spot treated previously with acid solution, and ailow to remain for 1 min

Wash off the drop of dye and clean the surface of the

test area thoroughly by rubbing with a clean cloth soaked in water and a light abrasive, such as magnesia, whiting or an equivalent abrasive, for 20 s Rinse thoroughly and m

Examine the test area and assess the intensity of the

stain by comparison with the examples illustrated in annex A

6 Expression of results

Express the loss of absorptive power in accordance with the classification given in annex A or as the

intensity of the stain, as a numerical value, in accordance with annex A

See foreword

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Page 4

EN 1237341998

7 l k s t report

"he test report shall include at least the following

infomation:

a) the type and identifídon of the specimen ~ÆS@

b) a reference to this European standard;

c) the anodizing specification (where horn);

d) the acid treatment used in the test (3.2.1

e) the coìour of the dye solution used in the test

f) the loss of absorptive power, or the intensity of

the stain as a numerical value (see clause 6);

NOTE Acceptance levels are normally specified in the relevant

product specification

g) any observations concerning the conduct of the

uneven density of staining);

h) the date of the test

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Page 6

EN 1237341998

Annex A (normative)

Interpretation of the results of the dye spot test

O BSI 04-1999

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BS EN

1237341999

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ALUMINIUM BLUE

2 LW

SANODAL RED Intensity of the Loss of absorptive

I B3LW

I BLEU ALUMINIUM

2L w Intensité de la tache du pouvoir absorbant Perte