Chrome-Plated Surfaces
Determination of the Microcracked Chrome Deposit
Previous issues
PV 1058: 1973-04, 1999-12, 2004-12Changes
The following changes have been made as compared to PV 1058: 2004-12:–Sections 3.2, 3.3, and 3.4 expanded Scope
This standard describes a method for determining the microcracked chrome deposit on chrome-plated surfaces.Description
Microcracked chrome deposit acc. to PV 1058
Test
Test equipment
A reflected light microscope with 100x to 200x magnification that has a dark field capacity in addition to
the normal bright field capacity is required to determine the microcracked chrome deposit. In order to count the microcracked chrome density, the microscope must either have etched measurement lines in the eyepiece or an image recording device that can be calibrated.
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2
3
3.1
Group Standard
PV 1058
Issue 2010-03
Class. No.:50221
Descriptors:
chromium, microcracked chrome deposit, chrome-plated, cracks
丁丁历险记电影
Check standard for current issue prior to usage.
This electronically generated standard is authentic and valid without signature.
The English translation is believed to be accurate. In ca of discrepancies the German version shall govern.
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Confidential. All rights rerved. No part of this document may be transmitted or reproduced without prior permission of a Standards Department of the Volkswagen Group.Parties to a contract can only obtain this standard via the B2B supplier platform
© Volkswagen Aktiengellschaft
VWNORM-2008-12m
Q U E L L E : N O L I S
Etching solution
In order to be able to evaluate the microcracked chrome deposit, etching is common in most cas.The aqueous etching solution contains 85,0 g/l NaOH and 53,0 g/l K 3(Fe(CN))6. Etching is omitted for chrome-plated plastic parts with microcracks.Procedure
周公解梦梦见洗头The specimen part is cleaned with methylated spirit or acetone and viewed at 100x magnification under the microscope using the dark field. If the microcracked chrome deposit is clearly identifiable,the number of cracks per cm is counted using the measurement lines in the eyepiece or by means of a calibrated recording.
怀孕几周可以药流If the crack network cannot be clearly identified, the part must be etched and then viewed anew under the microscope. The etching duration is approx. 20 min when the etching solution is unud and can be extended to 15 h. If a microcracked chrome deposit cannot be clearly identified even after this etching duration, then the etching solution is discarded, new solution is prepared, and the etching process is repeated.
Alternatively, anodic etching with a Couloscope® for 5 s at 0,5 A in 10% NaOH is permissible.Etched parts must preferably be evaluated at 100x magnification in the bright field. If the crack network cannot be identified clearly with this method, 200x magnification must be ud for the evaluation.Test report
尤加利叶花语The counted number of cracks, the crack structure (e.g., incomplete, regular) if necessary, and the position of the examined measurement areas must be indicated in the test report.总结陈词
Example: top of piston rod (according to drawing specification) 600 to 800 cracks/cm, partially in‐complete.Explanations of the images (magnification = 100 : 1)
Figure 1, Figure 2, Figure 3, Figure 4, Figure 5, and Figure 6 show typical unacceptable microcracked chrome deposit structures and microcracked chrome crack densities.
Figure 7 shows an irregular microcracked chrome deposit that is the cau of a complaint but is still accepted.
Figure 8, Figure 9, Figure 10, and Figure 11 show microcracked chrome crack densities that are evaluated as being OK.
3.2 3.3
3.4
3.5
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PV 1058: 2010-03
Figure 1 – Irregular microcracked chrome deposit,
< 100 to 400 cracks/cm
Figure 2 – Irregular microcracked chrome deposit,
< 100 to 200 cracks/cm
Figure 3 – Incomplete microcracked chrome de‐
posit
Figure 4 – Individual crack
Figure 5 – Overly coar microcracked chrome
deposit, < 100 cracks/cm
Figure 6 – Overly fine microcracked chrome de‐
posit, > 1 000 cracks/cm
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PV 1058: 2010-03
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Figure 7 – Irregular microcracked chrome deposit,
approx. 200 to 400 cracks/cm Figure 8 – Complete microcracked chrome de‐
梵蒂冈宫posit, approx. 250 to 400 cracks/cm
角多音字
Figure 9 – Complete two-layer microcracked chrome deposit, approx. 300 to 400 cracks/cm in
the upper crack layer
Figure 10 – Complete microcracked chrome de‐
posit, approx. 400 to 600 cracks/cm
Figure 11 – Complete microcracked chrome deposit, approx. 600 to 800 cracks/cm
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PV 1058: 2010-03
