ISO 2177:1972

Metallic coatings — Measurement of coating thickness — Coulometric method by anodic dissolution

Revêtements métalliques — Mesurage de l'épaisseur — Méthode coulométrique par dissolution anodique

General Information

• Status: Withdrawn
• Publication Date: 31-May-1972
• Withdrawal Date: 31-May-1972
• ICS: 25.220.40 - Metallic coatings
• Technical Committee: ISO/TC 107 - Metallic and other inorganic coatings
• Drafting Committee: ISO/TC 107 - Metallic and other inorganic coatings
• Current Stage: 9599 - Withdrawal of International Standard
• Completion Date: 01-May-1985

Relations

• Revised: ISO 2177:1985 - Metallic coatings — Measurement of coating thickness — Coulometric method by anodic dissolution
• Effective Date: 15-Apr-2008

Standards Content (Sample)

INTERNATIONAL STANDARD @ 2177
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INTERNATIONAL ORGANIZATION FOR STANDARDIZATION *MFXLlYHAI’OLIHAII 01’1 AHM3ALIMII no CTAHilAPl M3AUMM .ORGANISATION INTERNATIONALE DE NORMALISATION
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Metallic coatings - Measurement of coating thickness -
Coulometric method by anodic dissolution
First edition - 1972-06-15
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Ref. No. IS0 2177-1972 (E)
UDC 669.058 : 531.717 : 621.317.39
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Descriptors : metal coatings, thickness, dimensional measurement, anodic dissolution.
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Price based on 4 pages

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FOREWORD
IS0 (the International Organization for Standardization) is a worldwide federation
of national standards institutes (IS0 Member Bodies). The work of developing
International Standards is carried out through IS0 Technical Committees. Every
Member Body interested in a subject for which a Technical Committee has been set
up has the right to be represented on that Committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work.
Draft International Standards adopted by the Technical Committees are circulated
to the Member Bodies for approval before their acceptance as International
Standards by the IS0 Council.
International Standard IS0 2177 was drawn up by Technical Committee
ISOKC 107, Metallic and other non-organic coatings.
It was approved in July 1971 by the Member Bodies of the following countries :
Australia Israel Switzerland
Czechoslovakia Italy Thailand
Egypt, Arab Rep. of New Zealand Turkey
Portugal United Kingdom
France
Romania U.S.A.
Germany
South Africa, Rep. of U.S.S.R.
Hungary
India Spain
Ireland Sweden
No Member Body expressed disapproval of the document.
0 International Organization for Standardization. 1972
Printed in Switzerland

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INTERNATIONAL STANDARD IS0 2177-1972 (E)
Metallic coatings - Measurement of coating thickness -
Coulometric method by anodic dissolution
- the coating dissolves anodically at 100 % efficiency
1 SCOPE AND FIELD OF APPLICATION
(or at a nearly constant value close to this);
This International Standard specifies a procedure for
- a marked change in electrode potential occurs as the
measuring the thickness of metallic coatings by the anodic
coating is penetrated and an increasing area of substrate
dissolution method. The electrodeposited coatings and
is exposed.
substrates to which it applies are given in Table 1. It may
also be used to measure the thickness of coatings applied by
The electrolyte must be chosen in relation to the coating
L
other means, if due account is taken of special features such
and substrate metals, the current density and electrolyte
as the presence of an alloy layer.
circulation within the test cell. Typical electrolytes, which
have been found satisfactory for use with two types of test
apparatus for testing various electrodeposited coatings on
2 PRINCIPLE
specific substrates, are given in Table 2, their applications
being listed in Table 1. The electrolytes satisfactory with
Anodic dissolution of the coating from a well-defined area
one type of apparatus are indicated by symbols Al, A2,
of the coated surface using a suitable electrolyte.
etc., and those satisfactory with a second type of apparatus
by symbols B 1, 62, etc.
Indication of the end point of the test by the change in
electrode potential (and hence cell voltage) occurring when
TABLE 1 - Application of typical electrolytes (see Table 2)
the coating is virtually completely removed.
for electrodeposited coatings
Calculation of the coating thickness either
Substrate (Basis metali
- from the time interval between the start and end of
the test if the test is conducted at constant current Copper
and copper
Coating
density; or
alloys Plluminium
Steel Nickel
- from the quantity of electricity, recorded directly by
such as
an integrating meter, consumed in dissolving the coating.
brass
Cadmium Al 81 Al 81 Al - Al -
Chromium A2 82 A3 83 A2 B4 A2 84
3 TEST APPARATUS
--
A4 85 A4 86 A4 -
Coppar
Various types of apparatus may be constructed from
--
Lead - 88 - 88 - 88
readily available components (see Annex A). Suitable
--
complete instruments may also be purchased. Nickel A5 89 A5 810 A5 89
--
Silver A6 - A7 Ell A6 -
Tin A3 812 A3 812 A3 - A2 813
4 ELECTROLYTE
Zinc A8 814 A8 814 A8 - A8 -
The electrolyte to be used shall be such that :
NOTE - These electrolytes cannot te adapted to all apparatus
- there is no reaction with the coating metal in the
and when certain commercial instruments are used, it is therefore
desirable to follow the supplier's recommendations.
absence of an impressed flow of current;
1

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IS0 2177-1972 (E)
TABLE 2 - Typical electrolytes
Electrolyte
Notes
Potassium iodide (Ki) : 100 gli, with traces of iodine
Sodium sulphate (Na, SO, : 1 O0 911
Hydrochloric acid (HCI) : 73 g/I
Dilute 175 ml of hydrochloric acid
(d = 1.18) to 1 litre
or
Sodium hydroxide (NaOH) : 150 g/I
Sodium potassium tartrate (NaKC, H, O, 1 : 80 g
i in 1 iitrp
J . .
Ammonium nitrate (NH, NO, ) : 100 g
Ammonium nitrate (NH, NO, ) : 30 g
.. 1
i in litre
Sodium thiocyanate (NaCNS) : 30 g
Sodium nitrate (NaNO, ) : 1 O0 g
1 in 1 litre
Nitric acid ("0,) : 5 g
J
Potassium thiocyanate (KCNS) : 180 g/i
-
Sodium chloride (NaCl) : 100 g/l
Potassium chloride (KCI) : 30 g
in 1 litre
Ammonium chloride (NH, Ci) : 30 g
Orthophosphoric acid (H, PO, ) : 186 g
Dilute 118 ml of orthophosphoric acid
in 1 litre
(d = 1.751 and 10 g of chromic oxide
Chromic oxide (CrO, ) : 10 g
i
to 1 litre
Sodium carbonate (Na, CO, I : 100 g/1
For coatings up to 5 pm
~~
Orthophosphoric acid (H, PO, : 98 g/i
Dilute 64 ml of orthophosphoric acid
(d = 1.751 to 1 litre
A
...

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NORME INTERNATIONALE 2177
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Revêtements métalliques - Mesurage de l’épaisseur -
Méthode coulométrique par dissolution anodique
Première édition - 1972-06 15
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CDU 669.058 : 531.717 : 621.317.39 Réf. NO IS0 2177-1972 (F)
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r- Descripteurs . ievetement rnelaliiqiie, epdisseur, mesure de diriieiisiori, disçolutioil anodique
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Prix base sur 4 pages

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E
AVANT-PROPOS
IS0 (Organisation Internationale de Normalisation) est une fédération mondiale
de normalisation (Comités Membres ISO). L’élaboration de
d‘organismes nationaux
Normes Internationales est confiée aux Comités Techniques ISO. Chaque Comité
Membre intéressé par une étude a le droit de faire partie du Comité Technique
correspondant. Les organisations internationales, gouvernementales et non
gouvernementales, en liaison avec I’ISO, participent égaiement aux travaux.
Les Prolets de Normes Internationales adoptés par les Comités Techniques sont
soumis aux Comites Membres pour approbation, avant leur acceptation comme
Normes Internationales par le Conseil de I‘ISO.
La Norme internationale IS0 2177 a été établie par le Comité Technique
ISOiTC 1 07, Revêtements métalliques er autres revêtements non organiques.
Elle fut approuvée en juillet 1971 par les Comités Membres des pays suivants ;
Afrique du Sud, Rép. d‘ Irlande Suisse
Allemagne Israel Tchécoslovaquie
Australie Italie Thaïlande
Egypte, Rép. arabe d‘ Nouvelle-Zélande Turquie
Espagne Portugal U.R.S.S.
France Roumanie U.S.A.
Hongrie Royaume-Uni
Suède
I nde
Aücüiï Comité Membre n’a désapprouvé le document.
O Organisation internationale de Normalisation, 1972
imprimé en Suisse

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NORME INTERNATIONALE IS0 2177-1972 (F)
Revêtements métalliques - Mesurage de l'épaisseur -
Méthode coulométrique par dissolution anodique
i OBJET ET DOMAINE D'APPLICATION
dissolution anodique du revêtement avec un
reridement de 100 "% (ou Urie valeur constante voisine).
1'3 prewite Norrrir Inter ridtiundlt! specitie Uri procede pour
niewret 1 epdi'seur de5 revetempnts métdlliques Felon une appal iiioil d'une variation sensible du potentiel
rriethodr de dissoluriori dnodique Lrs depots d'electrode lorsque le revêtement eTt perfore et qu'une
rlr<'trol\ tii(ciei rl ItJ\ inetdux de bdw duxquels elle dirt? croissante de métal de base est exposée
Cettr methodr
i d[>pIiClUt! Wtit il<)tiii6'\ Cfdils it! TdbledU 1
1 'electrolytr doit etre choisi tiit torictiori du metai dr
prir* L+.~s\ etir iiti\tsee pour mesurer I'epdisseui de
reveternecit et cici rriétai de bdse, de ici densiié de cour-ail7 et
rrvPternents dippiic~iie\ par d'dcitres moyens \'il Pst teriii
(le Id rticddtik)ii de l'électrolyte a l'~i~terteur de Ili cellule
I ofiii>Ic ilrs ;iri'ti[ tildr tes trllrs que Ir prrsrrict! de CuuCht.s
(j ?\>',di Le=, eiectioiviw !ypt!i, qui orir &te trrjuvc\
1 iiildyt.
(,(JilVt!lidt~~~5 Ne[' diillx IviptiS d'appateiiidyt!. POUI COiltrOlei
(les tlepn!\ el~ttc~lyt~c;iir~ dit sur cies rnrirliix (11: t)dw
2 t>fiiNCIPt dpoi o1)r iph, ni dotiim ciai\ it, ?,ihleaii i' !wrs
qpiicdtiorii etdrit eriiirneree5 dari:, io T hltidci 1 Les
LJI\XJII !toil diiotliqiir LI ,c'vrterrieiil 5111 iiiie diie ttit,ri
élec t I < 1 I v tes dot i rid r i t sat I sf act i or I ~ec LI I i type
tititilir dt! id 2LiitdLt' It'VetLit: ell iitiliSdilt 1Jf1 t it?C.tfi)lkI?
{i' dp(JriJpl I?
( ?OX i~Olltldlll SdtlStdCtlOrl dVfX It! 5tX;OlId IVlX. d dppimillage
si)ii! icrmes 11~ir les svmt)oles B? B2 etc
~l~f~inliild~i(,i (Ji, p"!Ill illld/ 1 esSdl pdl Id VdlIdtlUII dU
~X)1C!litl~l 1) ?i?Lrl~JtfP (?I [Jdl ~(xi\eqUelit du VUltdy? de Id
crilule d'electt !il\/x) qiii be produit l~iisqiie IP reveterrwit d
I AH1 t A!) I Application des electrolytes types (voir Tableau 2)
prdtiqiirrnrnt çompletement disparu pour dépôts électrolytiques
Cdlciil de l'epaisseui de revêtemeiit
Metal de base
wit a F)dl tii de i'iiitervdlle de temps sepdrdiit le debiii
r
de Id tin de I'essdi, 51 l'essai est effectue a derisite de
I
Ciiivre I
I
courdnt constante
et alliages
3evêtement
ACWI de cuivre Nlckei Aiuminium Zinc
wit a partir dr là qudritite d'electricite consommee,
tels que
pour dissoudre le revetement, determinée directement
iditon
pat un inteyrateui incuipore
Cadm I u m Al 61 Al B1 Al Al
Chrome A2 82 A3 83 A2 84 A2 84
3 APPAREILLAGE
Cuivre A4 85 A4 B6 A4 B7
Divers types d'dppdreils peuverit etre construits a partir de
Plomb 88 BU 08
composdnts disponibles (voir Anriexr A) Des appareils
Nickel A5 B9 AS E10 A5 B9
complets convenables peuvent egalement etre trouvés ddns
le commerce
Argent Ab A7 H11 A6
Etain A3 812 43 812 A3 A7 613
Zinc A8 814 A8 I314 48 A8
4 ELECTROLYTE
1- eiectiolyte a utili',er doit repondre dux conditions
suivantes .
NOTE 0s électrolytes peuvent tic pas convenir a tous les appd
abserice de reaction dvec le metal de revetement en reils, et lors de l'utilisation de certains instrumt'nts commerciaux
il est donc préférable de suivre les instructions du fournisseur.
l'absence de courant électrique,
1

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i
i B8 ! Acetate de sodium iCH, i.OON,ir 200 y
AÇetdte d ammonium i( H ~ COONH, )
200 y
Nitrate d'ammonium INH, NO, t 800 y
iBg i
Thiouree IiNn- IL CSI
3 8 y
I 810 i Acide chlorhydrique iHC,I! 12 yil
11
j BI1 I Fluorure de potassium (YFI 100 yiI
I
t
t
' B12 1 Nitrate de potassium iKNO 1 100 y
&ria 1 litre
Chlorure de potdssiurn iKL0 100 y
4
>
1 813 Acide sulfurique (H,S
...