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ASTM B995-15

(Test Method)

Standard Test Method for Chloride Resistance Test for Chromium Electroplated Parts (Russian Mud Test)

Standard Test Method for Chloride Resistance Test for Chromium Electroplated Parts (Russian Mud Test)

SIGNIFICANCE AND USE
2.1 This test is used for specification acceptance, simulated service evaluation, manufacturing control, and research and development. It was developed specifically for use on components with electrodeposited chromium coatings exposed to hygroscopic chlorides. Test and production specimens may be used. Use of a standardized test could help in developing improved quality of chromium electrodeposited components and lead to the development of improved electroplated chromium systems.
SCOPE
1.1 This standard details a laboratory method to accelerate the effects of exposure to hygroscopic corrosive chloride compounds on electroplated chromium components. It is applicable to any substrate and coating system that utilizes electroplated chromium as the final metallic coating.  
1.2 Field experience has shown that hygroscopic chlorides are significantly more aggressive toward chromium electroplated deposits than sodium chloride. The most common of which is calcium chloride. Corrosion caused by these chlorides is commonly known as the Russian Mud effect.  
1.3 The standard does not specify exposure periods to be used for a specific product nor the interpretation to be given to the results. The suitability of this test and correlation of results with service experience should be determined before it is specified for coating systems.  
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
31-Mar-2015
ICS
25.220.40 - Metallic coatings
Technical Committee
B08 - Metallic and Inorganic Coatings
Drafting Committee
B08.10 - Test Methods
Current Stage
Ref Project

Relations

Referred By
ASTM B456-17(2022) - Standard Specification for Electrodeposited Coatings of Copper Plus Nickel Plus<brk/> Chromium and Nickel Plus Chromium
Effective Date
01-Apr-2015

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ASTM B995-15 - Standard Test Method for Chloride Resistance Test for Chromium Electroplated Parts (Russian Mud Test)ASTM B995-15 - Standard Test Method for Chloride Resistance Test for Chromium Electroplated Parts (Russian Mud Test)
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ASTM B995-15 - Standard Test Method for Chloride Resistance Test for Chromium Electroplated Parts (Russian Mud Test)
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: B995 − 15
StandardTest Method for
Chloride Resistance Test for Chromium Electroplated Parts
1
(Russian Mud Test)
This standard is issued under the fixed designation B995; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3. Apparatus
1.1 This standard details a laboratory method to accelerate
3.1 The apparatus required for this test consists of an
the effects of exposure to hygroscopic corrosive chloride
environment chamber capable of controlling both temperature
compounds on electroplated chromium components. It is
andhumiditywithinthespecifiedrange(see6.4).Thechamber
applicable to any substrate and coating system that utilizes
must be large enough to hold the test specimens without
electroplated chromium as the final metallic coating.
touching one another or the walls of the chamber. Also, the
reaction products formed on one specimen shall not fall on
1.2 Field experience has shown that hygroscopic chlorides
anotherspecimen.Materialsofconstructionshallnotaffectthe
are significantly more aggressive toward chromium electro-
corrosiveness of the test environment, nor be themselves
plated deposits than sodium chloride. The most common of
corroded by the test environment.
whichiscalciumchloride.Corrosioncausedbythesechlorides
is commonly known as the Russian Mud effect.
4. Reagents and Materials
1.3 The standard does not specify exposure periods to be
4.1 Table 1 specifies the laboratory grade consumable ma-
used for a specific product nor the interpretation to be given to
terials used in this test.
the results.The suitability of this test and correlation of results
TABLE 1
with service experience should be determined before it is
specified for coating systems. Item Name CAS # Description/Use
Deionized Water 7732-18-5
1.4 The values stated in SI units are to be regarded as
Kaolin 1332-58-7 Soil/mud base media
Calcium Chloride Dihydrate 10035-04-8 Corrosive media
standard. No other units of measurement are included in this
A
Sodium Hydroxide 1310-73-2 Solution pH adjustment
standard.
A
Sulfuric Acid 7664-93-9 Solution pH adjustment
Isopropyl Alcohol 67-63-0 Test sample cleaning
1.5 This standard does not purport to address all of the
A
safety concerns, if any, associated with its use. It is the For ease of control, solutions that are approximately 0.25 N are recommended.
responsibility of the user of this standard to establish appro-
5. Preparation of Test Slurry
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
5.1 Prepareasolutioncontainingdissolvedcalciumchloride
produced by maintaining a ratio of 57.5 g calcium chloride
2. Significance and Use
dihydrate for every 94 mL of deionized water and the equiva-
2.1 This test is used for specification acceptance, simulated
lent of 8 mLof 0.25 N NaOH. This solution should have a pH
service evaluation, manufacturing control, and research and
of approximately 9.6.
development. It was developed specifically for use on compo-
5.2 Mix the calcium chloride solution with kaolin at a ratio
nents with electrodeposited chromium coatings exposed to
of 3 g kaolin per 5 mL calcium chloride water.
hygroscopic chlorides. Test and production specimens may be
used. Use of a standardized test could help in developing
NOTE1—Varioussourcesofkaolinhavebeenshowntoperformequally
withinthistest.Thekaolinonlyactsasthe“mud/solidmaterial”withinthe
improved quality of chromium electrodeposited components
test slurry accounting for the term Russian Mud Test.
and lead to the development of improved electroplated chro-
mium systems.
5.3 Verification of pH of the slurry:
5.3.1 Dilute a portion of the slurry (for example, 10 mL) by
50% with deionized water.
1
ThistestmethodisunderthejurisdictionofASTMCommitteeB08onMetallic
and Inorganic Coatings and is the direct responsibility of Subcommittee B08.10 on NOTE 2—The diluted slurry cannot be used on test samples.
Test Methods.
5.3.2 Check the pH of the diluted slurry using a calibrated
Current edition approved April 1, 2015. Published May 2015. DOI: 10.1520/
B995–15. digital pH meter. A self-flushing probe is recommended.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
B995 − 15
5.3.3 ThepHofthedilutedslurryshallbeintherangeof6.5 7.2 At each inspection interval, remove samples from, or
to7.5.Ifnecessary,adjustthepHofthecalciumchlorideslurry turn off, the test chamber. Remove the agreed upon test spots
with either approximately 0.25 N sodium hydroxide (to
...

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