This document is to be considered as a whole, the parts of which shall not be separated.
“Seul le texte fran?ais fait foi, les traductions n’étant faites que pour en faciliter l’emploi”.
“The French text alone is valid. The translations are provided to assist the reader in understanding the
standards”.
? RENAULT 2002.
No duplication permitted without the consent of the issuing department.
No circulation permitted without the consent of RENAULT.
DATE OF ISSUE
May 1999 – – – This issue originates from Draft NC 1999 0219 / – – A
REVISIONS
October 2001 – – A Complete revision, the test piece or part sections are from now on
dealt with in draft Standards 2001 0527 and 2001 0528.
This issue originates from Draft NC 2001 0535 / – –
June 2002 – – B Paragraphs 3., 4., 5., 6., 7. and annexes 2. and 2.2. modified.
This issue originates from Draft NC 2002 0242 / – – -.
1. SCOPE AND FIELD OF APPLICATION
This test method is intended to describe a cycle of the cyclic corrosion test 1 (Essai de Corrosion
Cyclique 1: ECC1) on the associated equipment and the verifications which are necessary to make
sure that the test is in conformity.
This method may be applied to laboratory test pieces, to parts, or samples of vehicle parts.
2. PRINCIPLE
The test pieces and/or parts are placed in an automatic corrosion chamber where they are exposed to
a succession of attacks in controlled atmospheres, which simulate natural contamination by chloride
ions, exposure to hot and humid atmosphere, and hot and dry atmosphere conditions.
3. APPARATUS AND REAGENTS
3.1. AUTOMATIC CORROSION CHAMBER
This chamber shall make it possible to program the phases described below and to alternate them:
NOTE: All these phases shall be performed at a controlled temperature of 35°C±0,8°C; their
durations shall be programmable.
3.1.1. Contamination phase with spraying of saline solution
The machine design shall make it possible to adjust the spray homogeneity and to obtain a rain
quantity of 5 ml/h±1 ml/h at all points of the vat with the chamber empty or loaded.
The pressure is between 0,7 bar and 1,6 bar.
Moreover, in order to check that the salt spray phase has effectively taken place, the chamber shall
be fitted with a system used to check the flow rate and total consumption of the saline solution.
3.1.2. Controlled humidity and drying phase
The hygrometry shall be variable between 20 % and 95 % relative humidity with a constant air flow
rate according to the profile defined in annex 1.
The accepted tolerance is±3 % relative humidity, except for the 20 % relative humidity point where
the accepted tolerance is±5 %.
3.1.3. Flushing phase
This air flushing phase shall make it possible to eliminate the spray present in the chamber at the end
of the saline solution spraying phase.
3.1.4. Wall rinsing phase
This phase consisting in rinsing the chamber walls with de-mineralised water makes it possible to
eliminate the salts deposited during the saline solution spraying phase and thus prevents the
accumulation and therefore the concentration of salts during the cycles, which has an influence on the
relative humidity profile. This is done with a rinsing pipe with nozzles located on the circumference of
the vat. No spraying of de-mineralised water on the parts or test pieces is allowed.
3.1.5. Chamber environment
– This chamber shall be continuously connected to a saline solution tank. Use of a vat of limited
capacity is recommended (to avoid solution variations: pH, Cl%).
The vat shall be designed in such a way that it can be easily cleaned. Improper cleaning entails
high flow drops, and therefore has an influence on the final quality of the test.
This vat shall be made from a material which does not influence the pH (e.g. PVC), and shall be
opaque to prevent bacteria and algae development during the test, which entails a degradation
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