Tiêu chuẩn iso 08502 2 2017

© ISO 2017 Preparation of steel substrates before application of paints and related products — Tests for the assessment of surface cleanliness — Part 2 Laboratory determination of chloride on cleaned[.]

Preparation ofsteel substrates before

Part 2:

on cleaned surfac es

Pré aration des subjectiles d’acier a a t a plication de peinture s

et de produits assimilés — Essais p ur a précier la pro r té d’u e

surfc —

Partie 2: Reche che en la oratoire de s chlorure s sur le s surfce s

neto ée s

T ir d edition

2 17-0

COPYRIGHT PROTECTED DOCUMENT

© ISO 2017, P blshed in Sw itz rlan

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F reword i v

Introduction v

1 Sc ope 1

2 Nor mati ve r eferenc es 1

3 Principle 1

4 Re g ents and mater ials 1

5 A pparatus 2

6 Proc ed re .2

7 Ex pres io of r esults 3

8 Test rep r t 3

A nne x A (informative)Deter minatio of chloride by c oulometric titr atio 5

Biblog raphy 6

ISO (he Int ernational Org nization for Stan ardization) is a worldwidefede ation of national s an ards

b dies (ISO membe b dies) The work of pr p ring Int ernational Stan ards is normaly car ied out

through ISO t ech ical committ ees Each membe b dy int er st ed in a subje t for w hich a t ech ical

committ ee has be n es a lshed has the right t o be r pr sent ed on that committ ee Int ernational

org nizations, g ove nmental an non-g ove nmental, in laison with ISO, also take part in the work

ISO cola orat es closely with the Int ernational Ele trot ech ical C mmis ion (IEC) on al matt ers of

ele trot ech ical s an ardization

The proc d r s used t o develo this document an those int en ed for it furthe maint enanc ar

desc ibed in the ISO/IEC Dir ctives, Part 1 In p rticular the dife ent a pro al c it eria ne ded for the

dife ent ty es of ISO document should be not ed This document was draft ed in ac ordanc with the

edit orial rules of the ISO/IEC Dir ctives, Part 2 ( e www iso org dir ctives)

A tt ention is drawn t o the p s ibi ity that some of the element of this document ma be the subje t of

p t ent right ISO shal not be held r sponsible for identifying any or al such p t ent right Detais of

any p t ent right identified d ring the develo ment of the document wi be in the Introd ction an / r

on the ISO ls of p t ent de larations r c ived ( e www iso org p t ent )

Any trade name used in this document is information given for the convenienc of use s an does not

cons itut e an en orsement

For an ex lanation on the meaning of ISO spe ific terms an ex r s ions r lat ed to conformity as es ment,

as wel as information a out ISO’s adhe enc to the Wor ld Trade Org nization (WTO) principles in the

Te h ical Bar ie s to Trade (TBT) se the folowing URL: www iso org iso/ for word html

This document was pr p r d b Te h ical Committ ee ISO/TC 3 , Paints a d v rni shes , Subcommitt ee

SC 1 , Prep ration o s te l s ubs trates befr a plc atio o p ints a d r lated produc ts

This third edition canc ls an r plac s the se on edition (ISO 8 0 - 2:2 0 ), w hich has be n t ech icaly

r vised with the folowing chang es:

a) theanaly sis method has be n delet ed;

b) a sele tion of analy sis methods from othe s an ardsha e be n ad ed;

c) thecoulometric method has be n ad ed and briefly desc ibed in an informative annex;

d) the formula in Clause 7 has be n r plac d b F ormula (1) trans orming chloride conc ntration in a

solution t o amount of chloride on the surfac ;

e) thedocument has be n edit orial y r vised

ISO 8 0 consis s of the folowing p rt , u de the g ene al title Prep ratio o s te l s ubs trates befr

a plc ation o p ints a d r lated produc ts — Tes ts fr the as s es s ment o s urfc e clea lnes s:

— Part 2 : L b rator y determin tio o chloride o clea ed s urfc es

— Part 3 : As ses s ment o dus t o s te l s urfc es pr p r d fr p intin (pr s s ure -sens itive ta e meth d)

— Part 4 : Guida ce o the es timatio o the pro a i t y o c ondens atio prior to p int a plc atio

— Part 5: Meas ur ment o chloride o s te l s urf c es pr p r d fr p intin (io detec tio tu e meth d)

— Part 6 : Ex trac tio o s olu le c ontamin nts fr a alys i s — The B resle meth d

— Part 9: Field meth d fr the c onduc tometric dete min tio o wate -s olu le s alts

— Part 1 : Field meth d fr the turbidimetric dete min tion o wate -s olu le s ulf te

— Part 12 : Field meth d fr the titrimetric dete min tion o wate -s olu le fe ro s io s

The pe formanc of prot ective co tings of p int an r lat ed prod ct a pled t o st eel is signif icantly

afe t ed b the s at e of the st eel surfac immediat ely prior t o painting The princip l fact ors that ar

k own t o influenc thispe formanc ar as folows:

a) pr senc of rus an mi scale;

b) pr senc of surfac contaminant , inclu ing salt , d s , oi s an gr ases;

c) surfac profile

The ISO 8 0 , ISO 8 0 an ISO 8 0 se ies of Int ernational Stan ards ha e be n pr p r d t o pro ide

methods of as es ing these fact ors, w hie the ISO 8 04 se ies pro ides guidanc on the pr paration

methods that ar a ai a le for cleaning st eel subs rat es, in icating the ca a i ties of each in at aining

spe if ied levels of cleanlnes

These se ies of Int ernational Stan ards do not contain r commen ations for the prot ective co ting

sy st ems t o be a pled t o the st eel surfac Neithe do they contain r commen ations for the surfac

q alty r q ir ment for spe if ic situations even though surfac q alty can ha e a dir ct influenc on

the choic of prot ective co ting t o be a pled an on it pe formanc Such r commendationsar fou d

in othe document such as national s an ards an codes of practic It wi l be ne es ary for the use s

of these Int ernational Stan ardst o ensur that the q alties spe ified ar

— comp tible an a pro riat e b th for the environmental con itions t o w hich the st eel wi l be ex osed

an for the prot ective co ting sy st em t o be used, an

— within theca a i ty of the cleaning proc d r spe if ied

The four se ies of Int ernational Stan ards r fe r d t o a o e deal with the folowing aspe t of

pr paration of st eel subs rat es befor a plcation of paint an r lat ed prod ct :

— ISO 8 0 on visual as es ment of surfac cleanlnes ;

— ISO 8 0 on t es s for the as es ment of surfac cleanlnes ;

— ISO 8 0 on surfac roughnes charact eris ics of blas -cleaned st eel subs rat es;

— ISO 8 04 on surfac pr p ration methods

Each of these Int ernational Stan ards is in turn divided int o sep rat e p rt This part of ISO 85 2

desc ibes a method for the as es ment of chloride-containing salt that ar r adi y soluble in wat er an

ar pr sent on a st eel surfac R ust ed st eel subs rat es, p rticularly of rus grades C or D ( e ISO 85 1-1),

even w hen blas cleaned t o pr paration grade Sa 3 ( e ISO 8 0 -1) can s i be contaminat ed b soluble

salt an cor osion prod ct These compou ds ar almos colourles an ar localz d at the lowes

p int of the rus pit If they ar not r mo ed prior t o p inting, chemical r actions can r sult in larg e

ac umulations of rus that des ro the adhesion betwe n the subs rat e an the a pled prot ective

co ting Even if the salt is r adiy soluble in wat er, it is oft en imp s ible t o r mo e it complet ely from the

surfac b a simple washing such as that desc ibed in this proc d r The method does not the efor

det ermine the t otal amou t of chloride on the surfac but gives an in ication of the cleanlnes level of

the surfac Prolonging the washing time should r mo e a larg er pro ortion of the salt

Preparation ofsteel substrates before application ofpaints

Part 2:

This p rt of ISO 8 0 desc ibes a method for the det ermination ofchloride-containing salt that ar

r adiy soluble in wat er and ar pr sent on a st eel surfac The method is also a plca le t o pr viously

co t ed surfac s This p rt of ISO 8 0 inclu es a method, a plca le in the f ield or in thela orat ory, for

washing of the surfac w hie seve al methods ar r fe r d t o for chloride analy ses

NOTE 1 ISO 8 0 -5 des rib s a f ield test or the determination of chloride on a surface

NOTE 2 T e precision of the method is limited by b th the ac uracy of the selected method of analy ses an by

u certainties in the sampling proced re T e e traction method might not take al the water soluble mat erial of

the surface d e t o

— soluble materialhiding in c evices, u der folds of metal or at the b tt om of pits, an

— soluble material hiding u der cor osion layer , pas ivation layer , in ibitor , oil, gre se, or other non-visible

thin f ilms as these b u dary layer can prevent contact with the u derlying salt for its removal

NOTE 3 T e performance of a paint system is afect ed by the amou t of soluble chloride remaining on the

surface T e ac epta le level of this contamination is related to the service con itions For further information

re arding levels of water -soluble salt contamination, se ISO /TR 1 2 5

2 Normati ve r eferences

The folowing document , in w hole or in p rt, ar normatively r fe enc d in this document an ar

in ispensa le for it a pl cation F or dat ed r fe enc s, only the edition cit ed a pl es F or u dat ed

r fe enc s, the lat es edition of the r fe enc d document ( inclu ing any amen ment )a pl es

ISO 3 9 , Wate fr a aly tic al la orator y use — S ec ific atio a d tes t meth ds

A def ined ar a of the st eel surfac is washed with a known v lume of wat er and as es ment of chloride

conc ntration in the wash wat er is then car ied out using ins rumental methods

4 Reag ents and materials

During the analy sis, useonly r ag ent of r co niz d analytical grade

5 A pparatus

5.1 Ruler

5.2 Metal spatula or knife

5.3 Gloves, of plas ics mate ial

5.4 Be ker , of ca acity 2 0 ml

5.5 Smal glas rod

5.6 Fite funnel

5.7 Fite paper, a pr ox imately 1 0 mm diamete

5.8 Me suring cylnder, of ca acity 5 ml

5.9 Volumetr ic flasks, of ca acities 5 ml, 1 0 ml an 1 0 0 ml

5.10 Volumetr ic pipetes, of ca acities 1 ml an 2 ml

6 Proc edure

6.1 Washing of the sur fac e

Car y out he t es at leas in d plcat e During the swa bing proc d r , pr vent ac idental contamination

of the wash wat er b using, for ex mple, clean plas ics glo es(5.3)each time

Mark out a t es ar a measuring a pro imat ely 2 0 0 mm

2

(for ex mple, 2 0 mm ×1 0 mm) using the

rule (5.1) an chalk or othe suita le means (4.2) R ecord the actual ar a in sq ar mi lmetr s

Mark two beakers (5.4) A and B Pour 45 ml of wat er (4.1) int o beaker A, using the measuring

cy lin e (5.8) So k an a sorbent cott on pad (4.3) in the wat er and thoroughly swa the t es ar a with

the p d Do not alow wat er t o drip from the p d or run of the t es ar a R emove the wat er from the

surfac with the a sorbent cott on p d an sq e z the washings int o beaker B

In the case of b r st eel, sc a e the surfac with the metal spatula or k ife (5.2) u ti bright metal is

ex osed an is of sufficient siz t o con uct a r pr sentative surfac r triev l or r plcat es the surfac

con ition spe if ied immediat ely prior t o co ting

R epeat the swa bing proc d r with seve al p rtions of wat er unti al the wat er in beake A has be n

used If the cott on pad be omes worn out, use a fr sh one an keepthe used a sorbent cott on p ds The

swa bing proc d r should takeat leas 1 min

Fi t er the washings, using the f ilt er p pe (5.7) and the f ilt er fu nel (5.6) an cole t the f iltrat e in the

v lumetric flask of ca acity 5 ml (5 9) Wash the used a sorbent cott on p ds an the f ilt er pa e with

smal p rtions of wat er (t otal 5 ml), using beaker B and the smal glas rod (5.5) Sq e z the pads an

cole t the washings in the flask Fi upt o the mark with wat er

NOTE An alternative method for sampling is des rib d in ISO 8 0 -6

6.2 Wash-wate anal ysis

F or the as es ment of chloride conc ntration in the wash-wat er, dife ent methods can be used

depending on eq ipment a ai a le an ac uracy r q ir d Some ex mples ar as folows:

— ion chromat ogra hy (ISO 1 3 4-1);

— det ection method of the ion det ection tube method (ISO 8 0 -5);

— ion sele tive ele trode (ISO 9 1 );

— coulometric titration, se An ex A

NOTE Both the ion detection tub method (ISO 8 0 -5) an the ion selective electrode (ISO 9 17) req ire

con itioning of the wash-water b fore analyses

If al salt pr sent in the wash-wat er ar conside ed t o be containing the anion chloride, con uctivity

measur ment can be used and conve t ed t o an as umed non-spe ific r sult using ISO 8 0 -9

Othe methods than those l st ed a o e might be a pro riat e The measur ment u c rtainty of the

method used shal alway s be taken int o ac ount an r p rt ed

Titration inclu ing me cury or chromat e containing subs anc s should be a oided d e t o health an

environmental hazards

7 Ex pres ion of r esults

Calculat e the amou t of chloride pe u it surfac ar a, ρ (Cl), ex r s ed in mi igrams pe sq ar

metr , using F ormula (1):

ρ

A

Cl

( )

=

× ⋅

c V

A 1 3

(1)

w he e

c is thechloride conc ntration in the wash-wat er, ex r s ed in mi igrams pe ltr ;

A is thesurfac ar a washed, ex r s ed in sq ar mi imetr s

V is thesampl ng v lume of wat er, ex r s ed in mi l ltr s (5 ml used in the proc d r of 6.1)

Di ution, e.g b ad ing acid or ion s r ngth adjust or or from ad ing a smal amou t of the sample t o

a larg er v lume of bufe solution (r q ir d for the ion det ection tube, the ion sele tive ele trode an

for the coulometric titration methods, r spe tively), shal be taken int o ac ount w hen calculating the

v lume t o be used in F ormula (1)

8 Test r eport

The t es r p rt hal contain at leas the folowing information:

a) al detai s ne es ary t o identify the surfac t est ed, inclu ing detais of sha e an at itu e (e.g

horizontal, ve tical, at an angle);

e) any deviations from the t es method spe if ied;

f) any u usual featur s (anomales)o se ved d ring the t est ;

g) dat e() of the t es

A nne x A

Principle for the method: A cur ent is p s ed betwe n a cathode an a siver-containing anode plac d

in a bufe solution t o w hich a p rtion of a r fe enc solution with k own chloride cont ent is ad ed

folowed b the sample The chlorideions wi l r act with the prod c d sive ions forming a pr cipitat e

The en point can be det ect ed b chang es in solution con uctivity d e t o the pr senc of ex ces si ve

ions in solution or b pot ential chang es

A ccuracy of the method is depen ent on the sy st em used for control ng cur ent an the en p int, the

bufe solution an ele trodes used (afe ting the cur ent eff iciency an solubi ty of spe ies formed),

the ac uracy of the r fe enc solution, the dife enc in chloride conc ntration betwe n the r fe enc

an the sample an the use of the ins rumentation

If comme cial ins rument ar used, it is vital t o folow the ins rument man al, using pro e bufe

solutions et c