公开(公告)号：US20150362423A1

公开(公告)日：2015-12-17

申请号：US14122998

申请日：2012-05-28

申请人： Zehbour Panossian ,  Sérgio Eduardo Abud Filho ,  Neusvaldo Lira de Almeida ,  Mário Leite Pereira Filho ,  Diogo de Lima e Silva

发明人： Zehbour Panossian ,  Sérgio Eduardo Abud Filho ,  Neusvaldo Lira de Almeida ,  Mário Leite Pereira Filho ,  Diogo de Lima e Silva

IPC分类号： G01N17/00 ,  G01N17/04

CPC分类号： G01N17/006 ,  F17D5/08 ,  G01N17/043

摘要： This invention, which pertains to the field of testing of the corrosion-resistance of materials, includes devices (a probe formed by a permanent reference electrode with corrosion coupons and an electronic switch) and a measurement method for evaluating the probability of corrosion of buried ducts due to alternating current (AC), and aims at providing a methodology that eliminates ohmic losses and allows the desired measurement to be obtained. For that purpose, a probe formed by a permanent copper or copper sulphate reference electrode (ECSC) with four corrosion coupons was developed, and an electronic switch which was also developed within the scope of this invention is coupled to this probe. This assembly (probe and switch), associated with a preferably portable digital oscilloscope or a data acquisition device with digital signal processing (DSP), makes it possible to obtain the waveform of the pipe/ground potential AC+DC off, and hence the peak potential of this waveform, this value being used to predict the corrosion of buried, cathode-protected ducts due to alternating current, on the basis of the criterion that corrosion due to alternating current will not occur or will be insignificant if the peak of the waveform of the pipe/ground potential AC+DC off is more negative than −0.85 VECSC. The present invention can also be directly used for monitoring external corrosion of ground ducts and to verify the real cathode protection potential of these ducts. In order to ensure the integrity of the ducts, this equipment can be installed at test points, at valve boxes and cathode protection rectifiers, as well as in zones where corrosion is suspected.

摘要翻译： 涉及材料的耐腐蚀性测试领域的本发明包括器件（由具有腐蚀试剂的永久参比电极和电子开关形成的探针）和用于评估埋管的腐蚀概率的测量方法 由于交流（AC），并且旨在提供消除欧姆损耗并允许获得所需测量的方法。 为此，开发了由具有四个腐蚀试样的永久性铜或硫酸铜参比电极（ECSC）形成的探针，并且在本发明范围内也被开发的电子开关耦合到该探针。 与优选便携式数字示波器或具有数字信号处理（DSP）的数据采集装置相关联的该组件（探头和开关）使得可以获得管/接地电位AC + DC的波形关闭，因此峰值 该波形的电位，该值用于根据交流电导致的腐蚀不会发生的原因，预测由于交流电导致的阴极保护管道的腐蚀，或者如果波形的峰值无效，则该值将不显着 的管/地电位AC + DC off比-0.85 VECSC更负。 本发明还可以直接用于监测地面管道的外部腐蚀，并验证这些管道的真实阴极保护电位。 为了确保管道的完整性，该设备可以安装在测试点，阀箱和阴极保护整流器以及怀疑有腐蚀的区域。