A method for the early detection of electrochemical corrosion and coating degradation utilizing an inexpensive, in situ electrochemical metallic sensor for sensing coating and material degradation, particularly for materials such as aluminum 2024-T3, 7075, 6061, cold rolled steel samples, and coated metal structures such as automobiles, bridges, aircraft, and ships has been developed. The sensor utilizes AC Impedance or Electrochemical impedance spectroscopy （EIS） to acquire a precise, low-frequency impedance signature and is comprised of conductive ink deposited on a coating in the shape of the outline of a quadrilateral or other configuration. The resulting apparatus is comprised of a coated, metallic coupon used as a sensor, while a metallic grid electrode is deposited onto the steel coupon, thereby eliminating the need for a remote or counter electrode （i.e., reduction from a traditional, three-electrode system to a two-electrode system）。 Relying on the relatively lower impedance of the metallic grid electrode versus the coated metal, the electrodes are able to demonstrate a lower, interfacial impedance than the three-electrode testing system. This two-electrode approach eliminates the need for an electrolyte use in conventional, three-electrode AC Impedance testing and enables in-situ analyses of metallic and/or coating systems.

 

　　

　　一種用于電化學(xué)腐蝕和涂層劣化早期檢測(cè)方法，用于檢測(cè)涂層和材料的降解，特別是對(duì)于材料，如鋁2024-T3,7075,6061,冷軋鋼試樣，并利用一種廉價(jià)的，原位電化學(xué)傳感器對(duì)涂覆金屬結(jié)構(gòu)，例如汽車，橋梁，飛機(jī)，船舶等的檢測(cè)方法已被開發(fā)出來(lái)。該傳感器利用交流阻抗或電化學(xué)阻抗譜（EIS），以獲得一個(gè)精確的，低頻率的阻抗信號(hào)，并包括沉積在涂層中的四邊形或其它結(jié)構(gòu)的輪廓的形狀上的導(dǎo)電性涂料。所得到的裝置包括涂覆，金屬試片作為傳感器，金屬柵電極沉積在鋼試樣，從而省去了一個(gè)遠(yuǎn)程或反電極（即，從傳統(tǒng)的三電極系統(tǒng)還原到雙電極系統(tǒng)）。由于金屬柵電極相對(duì)于涂層金屬相對(duì)較低的阻抗，電極是能夠表現(xiàn)比三電極測(cè)試系統(tǒng)更低的界面阻抗。