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Originally developed in the late 1990’s, the Renault cyclic corrosion test, officially D17 2028, is universally known as the ECC-1 test (from the French; Essai de Corrosion Cyclique 1).
This test comprises of a multi-function cycle, during which test samples are exposed to a complex sequence of precisely controlled climatic conditions. This sequence is then repeated a number of times.
Compared to traditional salt spray fall-out rates of 1.5ml per hour per 80cm2, with a control accuracy of ±33% tolerance, the ECC-1 salt spray fall-out rate is much higher at 5ml per hour per 80cm2, with a tighter than usual control accuracy of ±20%. It also uses a much weaker electrolyte of approximately 1% NaCl.
The test temperature required is a continuous +35°C with a control accuracy of ±2.5°C during humidity transitions and ±1.0°C during constant humidity control. The test humidity required varies between 20, 55 & 90%RH, with a control accuracy of ±5% at 20%RH, and ±3% at 55 & 90%RH.
These conditions must be verified using independent, calibrated instrumentation, measured over a wide range of horizontal and vertical points inside the chamber. In addition to these demanding control requirements, the ECC-1 test also requires automatic purging and rinsing of the chamber interior, after the salt spray phase.
Specimens are placed in the chamber and subject to a series of distinctive phases, the pre-conditioned temperature of 35°C should be maintained throughout.
For a single test the last 2 stages should be repeated, ensuring a minimum test duration of 12 hours.
Developed by Renault EEC-1 is an integral part of their internal development and supplier Quality Control & Auditing processes.