Tiêu chuẩn iso 04623 2 2016

© ISO 2016 Paints and varnishes — Determination of resistance to filiform corrosion — Part 2 Aluminium substrates Peintures et vernis — Détermination de la résistance à la corrosion filiforme — Partie[.]

P aints and varnishes — Determination

Part 2:

Peinture s et ve nis — Déte mination de la résista c à la cor osion

filiforme —

Partie 2: S bjec tile s en aluminium

S con edition

2 16-0 -1

Refer ence n mb r

COPYRIGHT PROTECTED DOCUMENT

© ISO 2016, 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 Terms and definitions 1

4 Principle 2

5 S mpl ng 2

6 A pparatus 2

7 Re g ents 2

8 Test panels 2

8.1 Mate ial an dimensions 2

8.2 Pr eparation an co ting 3

8.3 Drying an con itioning 3

8.4 Thicknes of co ting 3

9 Proc ed re .3

9.1 Dete mination 3

9.2 S ribing the tes p nels 3

9.3 Tes ing 5

9.4 Inspe tion of tes panels

5 10 Evaluatio of the deg r ee of fiifor m cor r osion 5

11 Precision 5

12 Test rep r t 5

Biblog raphy 7

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 t erms an ex r s ions r lated 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

The committ ee r sp nsible for this document is ISO/TC 3 , Paint a d v rni shes , Subcommitt ee SC 9,

G ene al tes t meth ds fr p ints a d v rni shes

This se on edition canc ls an r plac s the f irs edition (ISO 46 3- 2:2 0 ), w hich has be n t ech icaly

r vised It also incorp rat es the Te h ical C r ig en um ISO 46 3- 2:2 0 /Cor 1:2 0 The folowing

main chang es ha e be n made:

a) d pl cat e det ermination has be n chang ed t o triplcat e det ermination;

b) information on the sha e of the sc ibe markshas be n ad ed;

c) thewidth of the sc ibe markshas be n chang ed t o be in lne with EN 3 6 ;

d) a not e on using theCAS t es for initiating f ilform cor osion was ad ed;

e) thesup lementary t es con itions pr viously in An ex A have be n int egrat ed in the t es r p rt

ISO 46 3 consis s of the folowing part , u de the g ene al title Paints a d v rni shes — Dete min tion o  

r s i s ta c e to fi frm c or os io :

— Part 1: Ste l s ubs trates

— Part 2 : Aluminium s ubs trates

A sc ibe mark cut through a co ting of p int or v rnishes on metal can give rise t o v rious ty es of

cor osion, such as blst ering of the co ting, cor osion of the metal u de the co ting as wel as fil form

cor osion Fi form cor osion t ends t o develo u de spe ific conditions of t empe atur an r lative

h midity an w hen trac s of acids, b ses or salt ar pr sent eithe u de the paint co ting or at br aks

in the co ting These con itions ar oft en fou d in marine an / r in us rial environment A c rtain

amou t of un er-cor osion of the co ting, s arting from the sc ibe mark, wi l alway s oc ur Fi form

cor osion, howeve , is conside ed t o be pr sent only if the ty ical p tt ern in the form of thr ads is

o vious

P aints and varnishes — Determination ofresistanc e to

Part 2:

This p rt of ISO 46 3 desc ibes a t es proc d r for as es ing the prot ective action of co tings of

p int or v rnishes on aluminium a ains filform cor osion arising from a sc ibe mark cut through the

co ting

It is only suita le for as es ing the pe formanc of the co ting subs rat e combination t est ed It is not

suita le for pr dicting the pe formanc of the co ting on dife ent subs rat es

2 Normati ve r eferences

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

an ar indispensa le for it a plcation F r dat ed r fe enc s, only the edition cit ed a pl es F or

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

ISO 1 1 , Paints a d v rni shes — Ex min tio  a d pr p ratio  o  tes t s amples

ISO 1 14, Paint a d v rni shes — Sta dard p nel s fr tes tin

ISO 2 0 , Paint a d v rni shes — Dete min tion o fim thicknes s

ISO 3 7 , Paints a d v rni shes  a d their raw mate ial s — Tempe atur s a d h midities fr c onditio in  

a d tes tin

ISO 46 8-8, Paints a d  v rni shes  —  Ev lu tio   o  degradation  o  c oatin s  —  Des ig atio   o  q a tit y 

a d s i ze o defec ts, a d o intens it y o u ifrm cha ges  in a peara c e — Part 8: As s es s ment o degr e o  

delamin tio  a d c orros io  aro nd a sc ribe or othe  artific ial defec t

ISO 46 8-1 , Paint a d  v rni shes  — Ev lu tio   o degradatio   o  c oatin s  —  Des ig ation  o  q a tit y 

a d s i ze o defec ts, a d o intens it y o u ifrm cha ges in a peara c e — Part 10: As ses s ment o degr e o  

fi frm c or os io

ISO 1 5 8, Paints , v rni shes a d raw mate ial s fr p ints a d v rni shes  — S mpln

3 Terms and definitions

F or the purposes of this document, the folowing t ermsand definitions a ply

3.1

fi iform cor osion

ty e of cor osion proc eding un e a co t of p int, v rnish or r lat ed prod ct, in the form of thr ads,

g ene aly s arting from b r edg es or from local damag et o the co ting

Note 1 to entry: Usualy the thre ds are ir e ular in length an direction of growth, but they may also b ne rly

paralel an of ap ro imately eq al length They usualy fol ow the e trusion direction an do not c os over one

another They ne d t o b initiated by a gres ive ions

4 Principle

A co t ed t es p nel is sc ibed as def ined in 9.2 A smal amou t of hydrochloric acid is introd c d int o

the sc ibe mark through ex osur t o hydrochloric acid v pour The p nel is then ex osed in a t es

ca inet at 40 °C an a r lative h midity of 8 % The efe t of ex osur ar then ev luat ed b c it eria

a r ed in adv nc betwe n the int er st ed parties; these c it eria usualy being eithe of a subje tive

natur or as given in ISO 46 8-1

Take a r pr sentative sample of the prod ct t o be t est ed (or of each prod ct in the case of a multi-co t

sy st em), as spe if ied in ISO 1 5 8

Ex mine an pr p r each sample for t es ing, asspe if ied in ISO 1 1

6 A pparatus

Ordinary la orat ory a p ratus an glas war , t og ethe with the folowing:

6.1 Test cabinet , ca a le of being maintained at (40 ± 2) °C an a r elative humidity of (8 ± 5) %

The ca inet shal ha ve pr ovision for maintaining the panels in a horizontal position ( e Note) at leas

2 mm a art or, if spe ified, pr ovision for placing or hang ing the tes p nels in an a pr ox imately ve tical

p sition so that the dis anc betwe n the fac s of adjac nt p nels is at leas 20 mm

NOTE Due t o the hy gros opic action of the hydrochloric acid in the s rib mark,mixtures of wat er droplets

an hydrochloric acid can b formed Horizontal e posure wil result in more cor osion which proce ds in a

more re ular man er along the length of e ch s rib mark

6.2 C ntainer, made of acid-r esistant mate ial, with a ld, and ca a le of holding the tes p nels at a

distanc of (1 0 ± 10) mm fr om the surfac of the acid an at leas 2 mm fr om each othe

6.3 Sc ibe tool, consis ing of a sharp ins rument which wil pr od c sc ibe mar ks with the dimensions

spe ified in 9.2 an w ith wel-defined edg es There are many sc ibe to ls a vaia le, an the r esult of the

tes wil v ry depen ing on the to l used A desc iption of the sc ibe to l shal be g iven in the tes r ep rt

[se Clause 1 , item d)]

6.4 Ruler, ac urate to 1 mm

7 Reag ents

7.1 Hy rochloric acid, of analytical g rade, conc ntr ation 3 % (ρ = 1,19 g /cm

3

)

Theq alty an purity of the hydrochloric acid shal bekept cons ant

8 Test panels

8.1 Mater ial and dimensions

The t es p nels shal be of aluminium complying with the r q ir ment of ISO 1 14 and of minimum

dimensions 1 0 mm × 7 mm × 0,8 mm, u les othe wise spe ified, the short dimension being in the

dir ction of rol ing of the metal

8.2 Preparation and c oating

Pr p r the t es p nels as desc ibed in ISO 1 14, u les othe wisespe if ied, and then co t them b the

spe if ied method with the prod ct or sy st em u de t es

Unles othe wise spe ified, the b ck an edg es of the panel shal also be co t ed with the prod ct or

sy st em u de t es

If the co ting on the b ck an edg es of the p nel dife s from that of the prod ct u de t es , it hal ha e

cor osion r sis anc gr at er than that of the prod ct u de t es

8.3 Drying and c onditioning

Dry (or st ove) an ag e ( if a plca le) each co t ed t es panel for the spe if ied time un e the spe ified

con itions, an , u les othe wise spe if ied, con ition them at the s an ard t empe atur an r lative

h midity defined in ISO 3 7 for at leas 1 h, with fr e cir ulation of air an without ex osing them t o

dir ct su lght The t es proc d r shal then be car ied out as so n as p s ible

8.4 Thicknes of c oating

Det ermine the thick es , in mic ometr s, of the dried co ting b one of the non-des ructive proc d r s

desc ibed in ISO 2 0

Car y out al t es s in triplcat e unles othe wise a r ed

9.2 Sc ibing the test panels

Unles othe wise spe ified, make two sc ibe marks, each at leas 3 mm long, on each t es p nel,

making the sc ibe marks pe pen icular t o each othe The dis anc betwe n the sc ibe marks an from

the sc ibe marks t o the edg e of the panel shal be at leas 2 mm ( e Figur 1) The sc ibe marks shal

be of width 1 mm t o 2mm ( e Figur 2), unles othe wise a r ed

R emo e the debris from the sc ibe marks The co ting shal be smo th at the edg es of the sc ibe mark

Ensur that the metal is clearly visibleover theentir length of the sc ibe marks b using a ma nifying

glas of × 0 ma nif ication

If the aluminium has surfac clad ing, then the sc ibe mark shal penetrat e through the clad ing la e

b 0,0 mm t o 0,1 mm ( e Figur 2)

Dife ent sc ibing devic s prod c dife ent amou t of cor osion in the sc ibe mark, the efor the

manne of sc ibing an the ty eof t ool used shal be r p rt ed

Dimensions in milimetr es

Key

1 r oling dir ection

Figure 1 — Positio s of s ribe marks

Dimensions in milimetr es

Key

1 co ting

2 clad ing

3 substrate

Figure 2 — Shape of the s ribe mar ks

9.3 Testing

Int o the containe (6.2), plac (2 ± 2) ml of hydrochloric acid (7.1) pe ltr of containe volume

NOTE F or some materials, the CAS test specif ied in ISO 9 27 has b en fou d suita le for initiating the

f iliform cor osion proces at a higher rat e

Plac the t es p nels in the containe , fac down a o e the lq id, with the sc ibe mar ks ex osed t o the

v ap ur The dis anc betwe n the t es panels an the surfac of the lq id shal be (1 0 ± 1 ) mm, an

they shal be at leas 2 mm a art from each othe The p sition of the t es p nels d ring ex osur in the

t es ca inet (horizontal or ve tical) has an influenc on thet es r sult, an the efor it shal be not ed

Plac the ld on the containe an keep at a t empe atur of (2 ± 2) °Cfor (6 ± 5) min R emo e the t es

p nels, alow them t o s an at the s an ard conditions def ined in ISO 3 7 for 1 min t o 3 min an

then immediat ely plac them in the t es ca inet (6.1) at (40 ± 2) °C an (82 ± 5) % r lative h midity

unti the end of the spe if ied t es pe iod

It is r commen ed that a control spe imen pr p r d from a p int of k own d ra i ty be inclu ed with

each se ies of t es p nels

9.4 Inspection of test panels

Whe e a pro riat e, at the spe if ied int erv ls an on completion of the t es , inspe t the t es panels for

filform cor osion ( e Clause 1 ) During inspe tion, the p nels shal not be alowed t o r main out of

the ca inet or mor than 3 min, as a long er time ma afe t the develo ment of the f ilform cor osion

If the co ting is r mo ed (b s rip ing) at spe if ied int erv ls, make sur that enough t es p nels ar

plac d in the ca inet at he beginning of the t es

10 Evaluation ofthe deg ree offi iform corrosion

Using the rule (6.4), det ermine the length of the long es filament L an the mos fr q ent filament

length M as desc ibed in ISO 46 8-1

R eport the r sult for the two sc ibemarks sep rat ely, asthe sc ibe mark w hich is pe pen icular t o the

rol ng dir ction wi show much mor an long er fil form cor osion

If spe if ied, det ermine cor osion othe than f il form a out he sc ibe marks as desc ibed in ISO 46 8-8

If spe if ied, r move the co ting with a non-cor osive p int r mo e an r -ex mine the subs rat e

P ot ogra hs of the t es p nels taken at the en of the t es ma be helpful in as es ing the ext ent of the

filform cor osion

11 Precision

No r lev nt pr cision data ar cur ently a ai a le

ISO/TC 3 int en s t o o tain pr cision data for al r lev nt s andards, inclu ing this p rt of ISO 46 3

When pr cision data ar a aia le, they wi l be incorp rat ed in this part of ISO 46 3

12 Test r eport

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

a) al detais ne es ary t o identify the prod ct t est ed;