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1. (WO2010078547) PROCESS FOR EVALUATING CORROSION RESISTANCE OF COATING
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/2010/078547 International Application No.: PCT/US2010/020029
Publication Date: 08.07.2010 International Filing Date: 04.01.2010
IPC:
G01N 17/00 (2006.01) ,G01N 17/02 (2006.01) ,G01N 27/26 (2006.01)
G PHYSICS
01
MEASURING; TESTING
N
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
17
Investigating resistance of materials to the weather, to corrosion, or to light
G PHYSICS
01
MEASURING; TESTING
N
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
17
Investigating resistance of materials to the weather, to corrosion, or to light
02
Electrochemical measuring systems for weathering, corrosion or corrosion-protection measurement
G PHYSICS
01
MEASURING; TESTING
N
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
27
Investigating or analysing materials by the use of electric, electro-chemical, or magnetic means
26
by investigating electrochemical variables; by using electrolysis or electrophoresis
Applicants:
E. I. DU PONT DE NEMOURS AND COMPANY [US/US]; 1007 Market Street Wilmington, Delaware 19898, US (AllExceptUS)
ZHANG, Shi Hua [CN/US]; US (UsOnly)
PELOSI, Lorenzo Fred [US/US]; US (UsOnly)
NAHAS, Robert, C. [US/US]; US (UsOnly)
Inventors:
ZHANG, Shi Hua; US
PELOSI, Lorenzo Fred; US
NAHAS, Robert, C.; US
Agent:
DESHMUKH, Sudhir, G.; E. I. du Pont de Nemours and Company Legal Patent Records Center 4417 Lancaster Pike Wilmington, Delaware 19805, US
Priority Data:
61/204,15902.01.2009US
61/289,48423.12.2009US
Title (EN) PROCESS FOR EVALUATING CORROSION RESISTANCE OF COATING
(FR) PROCÉDÉ POUR ÉVALUER LA RÉSISTANCE À LA CORROSION D'UN REVÊTEMENT
Abstract:
(EN) The present invention is directed to a process for corrosion resistance evaluation of coated metals substrates, such as autobodies. An anode and cathode coated with protective coating being tested are exposed to an electrolyte in a chamber of a corrosion resistance evaluator. These coatings are provided with predetermined and standardized defects, such as micro-holes to accelerate the corrosion of the underlying metal substrate in a predictable and repeatable manner. The coated cathode/anode pair is subject to a start-up period followed by series preset DC voltages for preset durations that are interspaced with recovery periods. The impedance data collected are then used to arrive at the corrosion performance resistance of the coating applied over the cathode/anode pair. The foregoing evaluator substantially reduces the time required to test corrosion from several days (40 plus days) to few days (about two days).
(FR) La présente invention concerne un procédé d'évaluation de la résistance à la corrosion de substrats métalliques recouverts d'un revêtement, tels que des carrosseries automobiles. Une anode et une cathode recouvertes d'un revêtement de protection sont exposées, en cours d'essai, à un électrolyte dans une chambre d'un évaluateur de résistance à la corrosion. Ces revêtements présentent des défauts prédéfinis standardisés, tels que des micro trous, afin d'accélérer la corrosion du substrat métallique sous-jacent de manière prévisible et répétitive. La paire cathode/anode recouverte d'un revêtement est soumise à une période de démarrage suivi de séries de tensions de courant continu prédéfinies, sur des durées prédéfinies, qui sont intercalées avec des périodes de restauration. Les données d'impédance collectées sont ensuite utilisées pour parvenir à la performance de résistance à la corrosion du revêtement appliqué sur la paire cathode-anode. L'évaluateur précité réduit sensiblement le temps requis pour tester la corrosion, de plusieurs jours (40 jours et plus) à quelques jours (environ deux jours).
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Designated States: AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IS, JP, KE, KG, KM, KN, KP, KR, KZ, LA, LC, LK, LR, LS, LT, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PE, PG, PH, PL, PT, RO, RS, RU, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW
African Regional Intellectual Property Organization (ARIPO) (BW, GH, GM, KE, LS, MW, MZ, NA, SD, SL, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, SE, SI, SK, SM, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, ML, MR, NE, SN, TD, TG)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
EP2384430US20120095698