US 12,332,275 B2
Use of scanning electrochemical microscopy as a predictive technique in a salt fog corrosion test
Gaëlle Charrier, Gif-sur-Yvette (FR); Aurélien Doublet, Gif-sur-Yvette (FR); Guy Deniau, Gif-sur-Yvette (FR); and Renaud Cornut, Gif-sur-Yvette (FR)
Assigned to COMMISSARIAT À L'ÉNERGIE ATOMIQUE ET AUX ÉNERGIES ALTERNATIVES, Paris (FR); and CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE, Paris (FR)
Appl. No. 17/905,774
Filed by COMMISSARIAT À L'ENERGIE ATOMIQUE ET AUX ÉNERGIES ALTERNATIVES, Paris (FR); and CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE, Paris (FR)
PCT Filed Mar. 12, 2021, PCT No. PCT/FR2021/050422
§ 371(c)(1), (2) Date Sep. 7, 2022,
PCT Pub. No. WO2021/181053, PCT Pub. Date Sep. 16, 2021.
Claims priority of application No. 2002450 (FR), filed on Mar. 12, 2020.
Prior Publication US 2024/0210444 A1, Jun. 27, 2024
Int. Cl. G01Q 60/60 (2010.01); G01Q 10/06 (2010.01)
CPC G01Q 60/60 (2013.01) [G01Q 10/065 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A process for predicting corrosion resistance results which would be obtained for a surface S1 having undergone an anticorrosion treatment if the surface S1 was subjected to a salt fog corrosion test, the process comprising an analysis of the surface S1 by scanning electrochemical microscopy, wherein the analysis comprises the following actions:
i) measuring, under previously selected operating conditions, a current at n1 different points of the surface S1 by means of a scanning electrochemical microscopy probe to obtain n1 current values, n1 being an integer which is at least equal to 5;
ii) determining the percentage of the n1 current values obtained in step i) which are greater than or equal to a detection threshold D, any current value which is greater than or equal to D being considered as corresponding to a point on the surface S1 likely to be corroded in the salt fog test; and
iii) determining, from the percentage obtained in step ii), the number N of corrosion points/unit area likely to be presented by the surface S1 if it was subjected to the salt fog test and comparing the number of corrosion points/unit area thus obtained with the maximum number Nmax of corrosion points/unit area that the surface S1 should have to successfully pass the salt fog test, whereby:
if N is less than the maximum number Nmax, then it is possible to predict that the surface S1 will effectively successfully pass this test, while
if N is greater than the maximum number Nmax, then it is possible to predict that this surface will not successfully pass this test.