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Salt spray corrosion test on a zinc coated steel

 

Reference of the ILC: CO17ZC
References of test methods: ISO 9227
Frequency: Each year
Main characteristics NSS (Neutral salt spray) - Loss of mass in a fixed exposure time, before and after removing the corrosion products. Selected exposure times: 2h and 168h.
Other characteristics A (against ISO 10289), Percentage of corroded surface
Caution: The number of determinations may be low for the secundary characteristics, what may make inefficient the comparison between laboratories
                   
Determination of the assigned values (“true values” for each characteristic):
By statistical computation of the totality of the results with possible selection on competence criteria (accreditation, validation by a reference body, quantity of tests performed in the year), test to detect possible collusion, merging of results not obtained in reproductibility conditions, suppression of technically unvalid results.
Type of statistical computation:
Results are numerical. For each characteristic selected by the participant, 1 result shall be provided for each sample. The statistical computation will provide an assigned value with its attached uncertainty, values of standard deviations for repeatability, for reproductibility, limits of alerts for bias and repeatability of the participant, indiviual values for uncertainty of results of participants.
Number of samples per participant: 2x12
Product submitted to tests: Galvanised steel
Type of samples: Plates
Approximate dimensions of samples: ± 150x100x1 mm
Specific preparation to be performed by the participant:  Protection of edges