EN ISO 12683:2004

SLOVENSKI STANDARD
01-januar-2005
Mehansko nanesene cinkove prevleke – Zahteve in preskusne metode (ISO
12683:2004)
Mechanically deposited coatings of zinc - Specification and test methods (ISO
12683:2004)
Durch mechanisches Plattieren aufgebrachte Zinküberzüge - Anforderungen und
Prüfverfahren (ISO 12683:2004)
Dépôts de zinc par voie mécanique (matoplastie) - Spécifications et méthodes de
contrôle (ISO 12683:2004)
Ta slovenski standard je istoveten z: EN ISO 12683:2004
ICS:
25.220.40 Kovinske prevleke Metallic coatings
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 12683
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2004
ICS 25.220.40
English version
Mechanically deposited coatings of zinc - Specification and test
methods (ISO 12683:2004)
Dépôts de zinc par voie mécanique (matoplastie) - Durch mechanisches Plattieren aufgebrachte Zinküberzüge
Spécifications et méthodes de contrôle (ISO 12683:2004) - Anforderungen und Prüfverfahren (ISO 12683:2004)
This European Standard was approved by CEN on 24 June 2004.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the Central Secretariat or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2004 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 12683:2004: E
worldwide for CEN national Members.

Contents Page
Foreword.3
1 Scope .4
2 Normative references .4
3 Terms and definitions .5
4 Information and requirements to be agreed and documented by the purchaser .5
4.1 General.5
4.2 Essential information .5
4.3 Additional information .5
5 Substrate .6
6 Classification and designation of coatings .6
6.1 Service condition number.6
6.2 Class of zinc coating thickness and type of supplementary treatment.6
7 Requirements for pretreatments.7
7.1 Stress relief treatment before coating.7
7.2 Cleaning.7
8 Inspection .7
8.1 Appearance .7
8.2 Surface defects .7
8.3 Thickness .7
8.4 Adhesion.8
8.5 Corrosion resistance in accelerated salt spray test .8
8.6 Absence of hydrogen embrittlement .10
9 Sampling.10
10 Rejection.11
11 Attestation of conformity .11
11.1 General.11
11.2 Normal conditions .11
11.3 Specific conditions.11
Annex A (informative) Additional information.12
A.1 Coating application process.12
A.2 Coating corrosion resistance characteristics in outdoor environments.12
A.3 Specific supplementary coating types .13
A.3.1 Coating Type 1 .13
A.3.2 Coating Type 2 .13
A.3.3 Coating Type 3 .13
A.4 Relationship between coating weight and thickness .14
Annex B (normative) Zinc dust/powder specification.15
Bibliography .16

Foreword
This document (EN ISO 12683:2004) has been prepared by Technical Committee CEN/TC 262 “Metallic and
other inorganic coatings”, the Secretariat of which is held by BSI, in collaboration with Technical Committee
ISO/TC 107 “Metallic and other inorganic coatings”.
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 2005, and conflicting national standards shall be withdrawn at the
latest by May 2005.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard : Austria, Belgium, Cyprus, Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland
and United Kingdom.
1 Scope
This document specifies the requirements for coatings of zinc that have been mechanically deposited on to
fabricated metal articles to protect them from corrosion. It also describes the related test methods.
NOTE  Annex A describes the process of applying a metal coating that is called mechanical deposition. In this
instance the metal applied is zinc.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
EN ISO 1463, Metallic and oxide coatings - Measurement of coating thickness - Microscopical method (ISO
1463:2003)
EN ISO 2064:2000, Metallic and other inorganic coatings - Definitions and conventions concerning the
measurement of thickness (ISO 2064:1996)
EN ISO 2177, Metallic coatings - Measurement of coating thickness - Coulometric method by anodic
dissolution (ISO 2177:2003)
EN ISO 2178, Non-magnetic coatings on magnetic substrates - Measurement of coating thickness - Magnetic
method (ISO 2178:1982)
EN ISO 3497, Metallic coatings - Measurement of coating thickness - X-ray spectrometric methods (ISO
3497:2000)
EN ISO 9220, Metallic coatings - Measurement of coating thickness - Scanning electron microscope method
(ISO 9220:1988)
EN ISO 10111, Metallic and other inorganic coatings - Measurement of mass per unit area - Review of
gravimetric and chemical analysis methods (ISO 10111:2000)
ISO 2079:1981, Surface treatment and metallic coatings — General classification of terms
ISO 2080:1981, Electroplating and related processes — Vocabulary
ISO 2859-1, Sampling procedures for inspection by attributes — Part 1: Sampling schemes indexed by
acceptable quality level (AQL) for lot-by-lot inspection
ISO 9227, Corrosion tests in artificial atmospheres — Salt spray tests
ISO 9587, Metallic and other inorganic coatings — Pretreatments of iron or steel to reduce the risk of
hydrogen embrittlement
ISO 10474, Steel and steel products — Inspection documents
ISO 10587, Metallic and other inorganic coatings — Test for residual embrittlement in metallic-coated and
uncoated externally threaded articles and rods — Inclined wedge method
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN ISO 2064:2000, ISO 2079:1981 and
ISO 2080:1981 and the following apply
3.1
mechanically deposited coating
coating obtained by compacting metallic powder particles onto correctly prepared metallic substrates in a
rotating barrel in the presence of impact media (normally glass beads) and in a suitable chemical environment
without the use of an electric current or applied heat
3.2
apparent coating density
product of thickness, determined in accordance with EN ISO 1463, and mass per unit area, determined in
accordance with EN ISO 10111
4 Information and requirements to be agreed and documented by the purchaser
4.1 General
The following items to be agreed between the contracting parties, which are specified in the clauses referred
to, shall be fully documented. Both the definitive requirements specified in this document and the documented
items listed in 4.2 and 4.3 shall be satisfied before a claim of compliance can be made and verified.
4.2 Essential information
The following information shall be given:
a) number of this document;
b) nature of the basis material, its surface condition and roughness;
c) tensile strength of the article and before any requirements for stress relief before coating (see 7.1 and
7.2);
d) service condition number (see 6.1) or the classification code of the coating (see 6.2);
e) any supplementary finish required (see 6.2 and A.3);
f) acceptability and positions of defects on non-significant surfaces (see 8.2);
g) location at which coating thickness shall be measured, any maximum thickness if appropriate, and the test
method to be used' (see 8.3);
h) sampling procedure to be adopted (see Clause 9);
i) method for testing adhesion (see 8.4);
j) requirement for an attestation of conformity (see Clause 11);
k) any special requirements for appearance (see 8.1).
4.3 Additional information
The following additional information may be required and, if so, shall be specified by the purchaser:
a) any special post-plating treatment (see A.3);
b) any special packaging requirements for the coated articles;
c) requirement for any test report other than that specified.
5 Substrate
This document specifies no requirement for the condition, finish or surface roughness of the basis metal prior
to mechanical zinc plating. However, it should be recognized that the surface roughness of the coated
surface will be dependent on the initial roughness of the basis metal, and therefore this shall not be a cause
for rejection of the mechanical zinc plated coating.
6 Classification and designation of coatings
6.1 Service condition number
The service condition number shall be used to indicate the severity of the service conditions in accordance
with Table 1 (see EN 12500:2000, Annex E).
6.2 Class of zinc coating thickness and type of supplementary treatment
The zinc coatings shall be classified on the basis of thickness and the supplementary treatment required in
accordance with Tables 1 and 2.
Table 1 — Minimum coating thickness for mechanical
zinc coating
Class Minimum coating thickness
(µm)
Zn 110 M(Fe) 107
Zn 80 M(Fe) 81
Zn 65 M(Fe) 66
Zn 50 M(Fe) 53
Zn 40 M(Fe) 40
Zn 25 M(Fe) 25
Zn 12 M(Fe) 12
Zn 8 M(Fe) 8
Zn 6 M(Fe) 6
Table 2 — Supplementary coating finishing
Type Description
1 As coated, without supplementary treatment
2 With a yellow, opaque green or black coloured chromate
conversion treatment
3 With complementary treatment, as specified by the purchaser
7 Requirements for pretreatments
7.1 Stress relief treatment before coating
When specified by the purchaser, steel parts that have an ultimate tensile strength equal to or greater than
1000 Mpa (31 HRc) and that contain tensile stresses caused by machining, grinding, straightening, or cold
forming operations shall be given a stress relief treatment prior to cleaning and metal deposition. The
procedures and classes for stress relief heat treatment shall be as specified by the purchaser or the purchaser
may specify appropriate procedures and classes from ISO 9587. Stress relief heat treatment shall be carried
out before any electrolytic treatments are applied.
7.2 Cleaning
High strength steels, which become embrittled when charged with hydrogen, shall be cleaned before
application of the coating in non-electrolytic alkaline, anodic-alkaline processes.
High strength steels that have heavy oxide or scale on them shall be further cleaned using inhibited acid
processes to avoid the risk of producing hydrogen embrittlement.
8 Inspection
8.1 Appearance
When examined by the unaided eye or corrected vision the significant surfaces of the coated articles shall be
free from any visible defects such as blisters, pits, roughness, cracks or uncoated areas and shall not be
stained or discoloured. The acceptability and positions of defects on non-significant surfaces shall be
specified by the purchaser. The coatings deposited shall have a uniform silvery appearance, and a matte to
medium bright lustre.
NOTE  Applied finishes generally perform better in service when the substrate over which they are applied is smooth
and free of torn metal, inclusions, pores, and other defects.
A metal finisher can often remove defects through special treatments such as grinding, polishing, abrasive
blasting, chemical treatments, and electropolishing. However, these are not in the normal treatment steps
preceding application of the finish. When desired they shall be specified by the purchaser.
8.2 Surface defects
Defects and variations in appearance in the coating that arise from surface condition of the substrate
(scratches, pores, roll marks, inclusions, etc.) and finishing practices shall not be cause for rejection.
The coating shall be uniform in appearance and substantially free of blisters, pits, nodules, flaking, and other
defects that can adversely affect the function of the coating. The coating shall cover all surfaces including
roots of threads, thread peaks, corners and edges. The coating shall not be discoloured throughout to an
extent that would adversely affect appearance as a functional requirement. However, superficial staining that
results from rinsing and variations in colour or lustre shall not be cause for rejection.
NOTE The nature of the mechanical plating process is such that the coatings are generally not as smooth or as bright
as some electroplated coatings.
8.3 Thickness
The thickness over the entire significant surface shall be measured in accordance with the following standards
within the conventions defined in EN ISO 2064.
The th
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