ISO 10216:2010
(Main)Anodizing of aluminium and its alloys — Instrumental determination of image clarity of anodic oxidation coatings — Instrumental method
Anodizing of aluminium and its alloys — Instrumental determination of image clarity of anodic oxidation coatings — Instrumental method
ISO 10216:2010 specifies an instrumental method for determining the image clarity of anodic oxidation coatings on aluminium and aluminium alloys by measuring reflection from the surface with the help of a sliding combed shutter. The test can only be applied to a flat surface which can reflect the image on the limited combed shutter and photo-receiver. This method can also measure the optical evenness of anodic oxidation coatings on aluminium and aluminium alloys.
Anodisation de l'aluminium et de ses alliages — Détermination de la netteté d'image sur couches anodiques — Méthode instrumentale
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 10216
Second edition
2010-03-15
Anodizing of aluminium and its alloys —
Instrumental determination of image
clarity of anodic oxidation coatings —
Instrumental method
Anodisation de l'aluminium et de ses alliages — Détermination de la
netteté d'image sur couches anodiques — Méthode instrumentale
Reference number
ISO 10216:2010(E)
©
ISO 2010
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ISO 10216:2010(E)
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ISO 10216:2010(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established 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. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
ISO 10216 was prepared by Technical Committee ISO/TC 79, Light metals and their alloys, Subcommittee
SC 2, Organic and anodic oxidation coatings on aluminium.
This second edition cancels and replaces the first edition (ISO 10216:1992), which has been technically
revised.
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ISO 10216:2010(E)
Introduction
Estimation of the image clarity of anodic oxidation coatings on aluminium and its alloys is normally carried out
visually by observing the clearness of an image on the surface. However, the image can be observed at
various angles and be confused with the gloss level of a surface, and while the degree of image clarity is
mainly influenced by the clearness of the coating, it is also affected by image distortion caused by surface
irregularities and the haziness of the coating layer. Standardized methods of determining image clarity were
therefore required.
This International Standard specifies the use of an instrumental method for measuring image clarity using an
[2]
optical comb. A related International Standard (ISO 10215 ) specifies the use of a chart scale also based on
an optical comb together with a lightness scale to rank image clarity.
NOTE This instrumental method provides more accurate measurements of image clarity and can be used in cases of
dispute.
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INTERNATIONAL STANDARD ISO 10216:2010(E)
Anodizing of aluminium and its alloys — Instrumental
determination of image clarity of anodic oxidation coatings —
Instrumental method
1 Scope
This International Standard specifies an instrumental method for determining the image clarity of anodic
oxidation coatings on aluminium and aluminium alloys by measuring reflection from the surface with the help
of a sliding combed shutter.
The test can only be applied to a flat surface which can reflect the image on the limited combed shutter and
photo-receiver. This method can also measure the optical evenness of anodic oxidation coatings on
aluminium and aluminium alloys.
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.
ISO 2128, Anodizing of aluminium and its alloys — Determination of thickness of anodic oxidation coatings —
Non-destructive measurement by split-beam microscope
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
image clarity
C
n
ability of the surface of an anodic oxidation coating to produce a clear image of an object facing the surface
NOTE Image clarity is expressed as a percentage.
3.2
optical evenness
E
overall uniformity of reflection diminished by the orientation of surface irregularities given by the ratio of the
longitudinal and traverse values of the image clarity, because the values of image clarity are usually different
in these directions
3.3
dispersion of light
D
change in image clarity produced by altering the comb width
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ISO 10216:2010(E)
4 Principle
Light comes through a first slit which serves as a light source and it is converted to parallel light through a first
lens (collimator), reflected at the surface of the test piece, which is set at 45˚ to the light beam, and is then
focussed at a combed shutter through a second lens (condensing lens). If the test piece has a completely flat
and smooth surface, the reflected beam is concentrated as a sharp image of the first slit at the combed shutter
when the shutter is slid laterally. When the centre of the comb space coincides with the image, the beam
passes completely through the space of the comb and generates a signal maximum on the photo-receiver.
Otherwise, the beam can not pass through the comb completely and generates a lower signal, depending on
the degree of dispersion of the light. This signal corresponds to the image clarity. Optical evenness is shown
by the ratio of the longitudinal and transverse values (see 8.4).
5 Apparatus
An example of the apparatus is shown in Figure 1. This instrument is constructed in a similar way to the split-
beam microscope in ISO 2128. The reflected image is focussed at the combed shutter and the quantity of light
coming through the space of the combed shutter is measured on the photo-receiver. The photo-receiver is
connected to a recorder which shows the horizontal progression of the combed shutter on the X-axis and the
quantity of light coming through the spaces of the combed shutter on the Y-axis. The general image clarity is
thus illustrated exactly by the heights of the waves. A modern instrument which does not use a recorder, but
measures the heights of the waves (M and m) of a test specimen for each comb, and when computing the
stored values, directly reads the image clarity, may be used.
The essential characteristics of the apparatus are given in 5.1 to 5.7.
5.1 A flat test-piece surface, set at 45˚ to the incident light and with the reflected image measured at 45˚
in the specular direction.
5.2 Lenses, of good quality and with a focal length of 130 mm.
5.3 A light source, consisting of a lamp with a filament not larger than 0,05 mm and capable of providing a
constant quantity of light during the measurement.
5.4 A slit, 0,02 mm ± 0,002 mm in width and about 20 mm in length.
5.5 A combed sliding shutter, consisting of a thin sheet with
...
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