Performa Korosi Baja Karbon Pada Uji Simulasi Pipa Untuk Sistem Saluran Air Pendingin [Corrosion Performance of Carbon Steel in Pipe Simulation Test for Cooling Water Systems]

IF 0.6 Q4 METALLURGY & METALLURGICAL ENGINEERING

Metalurgija Pub Date : 2019-11-15 DOI:10.14203/metalurgi.v34i2.468

A. Royani

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引用次数: 0

Abstract

The main problem in cooling water systems in geothermal power plant units is supported by corrosion, deposits, and slime. Corrosion can shorten the life of cooling water system equipment due to a decrease in operating efficiency, leakage, and pollution. These problems, occur very complex and many causes. On the other hand, most cooling water systems in the industry contain carbon steel components that are easily corroded. To determine the value of the corrosion rate of carbon steel in a geothermal power plant, a simulation test using an open recirculating system was carried out. The simulation process is done by an interval test method and based on NACE RP0775 standard. The corrosion rate of those steel was determined by weight loss method. The Morphology of surface and composition of corrosion products are characterized using scanning electron microscopy (SEM), X-ray diffractometer (XRD) and energy dispersive spectroscopy (EDS). The corrosion rate values of carbon steel from the simulation results for 1, 3 and 4 weeks were 2.29 mmpy; 1.23 mmpy; and 0.93 mmpy, respectively. There is a decrease in the corrosion rate of the simulation time is extended, because of passive film layers on the steel surface. Meanwhile, the most dominant water parameters in this simulation are dissolved oxygen (DO). The change of DO greatly affect the corrosion rate of carbon steel. Based on the product morphology of corrosion, corrosion attacks occur locally. Corrosion products form oxide compounds in the form of Fe 3 O 4 , FeOOH, and Fe 2 O 3 . Abstrak Masalah utama dalam sistem pendingin air dalam unit pembangkit listrik panas bumi meliputi korosi, deposit dan slime (lendir). Korosi dapat memperpendek umur pakai peralatan sistem pendingin air karena mengakibatkan penurunan efisiensi operasi, kebocoran dan polusi. Masalah-masalah tersebut sangat komplek dan banyak faktor penyebabnya. Di sisi lain, sebagian besar sistem air pendingin di industri mengandung komponen baja karbon yang mudah terkorosi. Untuk mengetahui nilai laju korosi baja karbon pada unit pembangkit listrik panas bumi, maka dilakukan uji simulasi menggunakan sistem resirkulasi air terbuka pada temperatur 37 °C. Proses simulasi dilakukan dengan metode interval test dan berdasarkan standar NACE RP0775. Laju korosi baja tersebut diukur dengan metode pengurangan berat. Morfologi permukaan dan komposisi produk korosi dikarakterisasi menggunakan SEM ( scanning electron microscopy ), XRD ( x-ray diffract ion ) dan EDS ( energy dispersive spectroscopy ). Nilai laju korosi baja karbon hasil uji simulasi selama 1, 3 dan 4 minggu masing-masing sebesar 2,29 mmpy; 1,23 mmpy; dan 0,93 mmpy. Terjadi penurunan laju korosi jika waktu simulasi diperpanjang akibat terbentuknya lapisan produk korosi pada permukaan baja. Sementara itu, parameter air yang paling menentukan laju korosi adalah DO (dissolved oxygen). Perubahan DO sangat mempengaruhi kecepatan laju korosi. Berdasarkan morfologi produk korosi, serangan korosi terjadi secara lokal yang sebarannya merata. Produk korosi berupa senyawa oksida dalam bentuk Fe3O4, FeOOH dan Fe2O3.

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冷却水系统管道模拟试验中碳钢的腐蚀性能

地热发电厂机组冷却水系统的主要问题是腐蚀、沉积物和黏液。腐蚀会使冷却水系统设备因运行效率降低、泄漏、污染而缩短使用寿命。这些问题，发生的非常复杂，原因也很多。另一方面，工业中的大多数冷却水系统都含有容易腐蚀的碳钢部件。为了确定热电厂碳钢的腐蚀速率值，采用开式循环系统进行了模拟试验。仿真过程采用间隔试验方法，基于NACE RP0775标准进行。用失重法测定了这些钢的腐蚀速率。采用扫描电子显微镜(SEM)、x射线衍射仪(XRD)和能谱仪(EDS)对腐蚀产物的表面形貌和组成进行了表征。模拟结果表明，碳钢在1、3、4周的腐蚀速率值为2.29 mmpy;1.23 mmpy;分别是0.93毫米。由于钝化膜层的存在，钢表面的腐蚀速率降低，模拟时间延长。同时，该模拟中最主要的水参数是溶解氧(DO)。溶解氧的变化对碳钢的腐蚀速率影响很大。从腐蚀产物的形貌来看，腐蚀是局部发生的。腐蚀产物以fe2o3、FeOOH和fe2o3的形式形成氧化物化合物。摘要:Masalah utama dalam系统悬垂空气dalam单元pembangkit liststrik panas bumi meliputi korosi，沉积物dan slime (lendir)。在空气中悬空的空气污染系统(karena mengakibatkan penurunan efisiensi operasi, kebocoran and polusi)Masalah-masalah tersebut sangat komplek dan banyak factor penyebabnya。迪塞西兰，塞巴吉萨尔系统空气悬吊，迪工业，孟加东，巴加尼，巴加尼，巴加尼，巴加尼。Untuk menggetahui nilai laju korosi baja karbon pada unit pembangkit listrik panas bumi, maka dilakukan uji simulasi menggunakan系统resirkulasi air terbuka pada温度37°C。本文以标准NACE RP0775为基准，模拟了双裂坎登干方法间隔试验。Laju korosi baja tersebut diukur dengan方法pengurangan berat。形态学permukaan dan komposisi产品korosi dikarakterisasi menggunakan SEM(扫描电子显微镜)，XRD (x射线衍射)和EDS(能量色散光谱)。Nilai laju korosi baja carbonhasil uji simulasi selama 1, 3, 4, minggu masing-masing sebesar 2,29, m;1、23 mmpy;丹0岁，93岁。Terjadi penurunan laju korosi jika waktu simulasi diperpanjang akibat terbentuknya青金石产品korosi pada permukaan baja。Sementara itu，空气参数yang paling menentukan laju korosi adalah DO(溶解氧)。Perubahan DO sangat mempengaruhi keepatan laju korosi。Berdasarkan morologi product korosi, serangan korosi terjadi secara local yang sebarannya merata。产品为Fe3O4, FeOOH和Fe2O3。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Metalurgija 工程技术-冶金工程

CiteScore

1.20

自引率

33.30%

发文量

审稿时长

4-8 weeks

期刊介绍： The journal Metalurgija is primary scientific periodical that publishes scientific papers (original papers, preliminary notes, reviewed papers) as well as professional papers from the area of basic, applicable and developing researching in metallurgy and boundary metallurgy areas (physics, chemistry, mechanical engineering). These papers relate to processing ferrous and non-ferrous metallurgy, treating investigating as well as testing of raw materials, semi products and products, especially in the area of improving new materials and possibilities of their implementation. The journal is the only national periodical of this kind in the Republic of Croatia and covers the scientific field of metallurgy, especially: physical metallurgy and materials; process metailurgy, (ferrous and non-ferrous); mechanical metallurgy (processing, power , etc.); related (adjoing) branches: mechanlcal engineering, chemistry, physics etc.