Corrosion Erosion of low carbon steel used in high Concentrated Sulphuric Acid

الموضوعات

علوم تطبيقية وتكنولوجية

الملخص

Metallic and composite coatings are one of the techniques for surface modification of the surfaces of metals and alloys for the purpose of giving them new properties in addition to their original properties or improving their original properties. The research problem is the low corrosion resistance of the carbon steel used in the manufacture of pipes for transporting concentrated sulphuric acid (98%) in the concentrated acid factory in the Al-Furat State Company. Chromium electroplating and chromium composite plating with silicon carbide particles on the base metal (carbon steel) were used for improving corrosion resistance. Electroplating of carbon steel was carried out with chromium metal at constant current density (20 A/dm²), voltage (4.5), distance between electrodes (5 cm), stirrer speed (300 rpm), PH (2), and optimum chrome plating was extracted based on Taguchi design (gray method) and by using Minitab program. Electroplating process included nine experiments with temperature range (40, 50, 60) degrees Celsius and the electroplating process time (1, 1.5, 2) hours, conducting tests for the chromium plating layer included (Vickers hardness, thickness, roughness), calculating the highest value of the gray relational grade. Electrodeposition of composite coatings of silicon carbide microparticles embedded in chromium on carbon steel was carried out based on the optimum chromium plating factors and three weights of silicon carbide microparticles were added to the chrome plating solution (10, 20, and 30) grams. Energy-dispersive X-ray Spectroscopy (EDS) and X-Ray Diffraction (XRD) tests were performed to confirm the elements and phases constituting the base metal (carbon steel), an optimum metal chromium plating sample, and three samples of composite coatings for silicon carbide microparticles (10, 20, and 30 g/l) embedded in chromium metal, as well as Scanning Electron Microscope (SEM) and Atomic Force Microscope (AFM) examinations. The optimum chromium plating properties assay values were as follows: hardness (740 kg/mm²), thickness (20.91 μm), and surface roughness (0.098 μm). Two types of corrosion rate tests were carried out by a weight loss method. The first test is a simple immersion test in static acid, and the second test is the (Corrosion-Erosion) test. The percentage of improvement that occurred on carbon steel protected with chromium metal plating and chromium silicon carbide composite coatings compared with the rate of corrosion of unprotected carbon steel in the simple immersion test is as follows: chromium plating (56.73%), Cr-10g/l (67.3%), Cr-20g/l (76.95%), Cr-30g/l (53.2%). The percentage of improvement that occurred on carbon steel protected with chromium metal plating and chromium silicon carbide composite coatings compared with the rate of corrosion of unprotected carbon steel in the (Erosion-Corrosion) test was as follows: chrome plating (24.53%), Cr-10g/l (72.56%), Cr-20g/l (80.26%), Cr-30g/l (59.86%). The polarization test was carried out for samples in concentrated sulfuric acid (98%), and the improvement rate in corrosion resistance that occurred on carbon steel protected with chromium metal plating and chromium silicon carbide composite coatings as follows: chromium plating (97.8%), chromium plating-10g/l (98.4%), chromium plating-20g/l (99.5%), chromium plating-30g/l (88.5%). The composite coatings with (chromium-20g/l silicon carbide) resist corrosion in conditions of concentrated acid flow (98%), where the corrosion rate is reduced by five times compared to the corrosion of carbon steel without a protective layer in (Erosion-Corrosion) test.

روابط وملفات

التعريف والنوع

رقم الوثيقة

021966e5-eaf8-4268-abcb-0a65fbb1b693

رقم العقد

0

نوع الوسائط

Crawler

نوع المحتوى

الرسائل العلمية

صيغة المصدر

رسائل ماجيستير

نوع الملف

pdf text

أسماء الملفات

995575_1.pdf

بيانات النشر

ترجمة العنوان

التأكل تعرية للفولاذ الكربوني الواطى المستخدم في حامض الكبريتيك المركز

ألقاب المؤلفين

[{"name_ar":"إقبال محمد سعيد صالح","title_ar":"اشراف","title_en":"Supervision"},{"name_ar":"حيدر عبد حسن الجبوري","title_ar":"اشراف","title_en":"Supervision"},{"name_ar":"نذير رزاق علي صالح","title_ar":"اعداد","title_en":"Preparation"}]

اللغة

English

المصدر والدورية

اسم المصدر

Corrosion Erosion of low carbon steel used in high Concentrated Sulphuric Acid

المحتوى والصفحات

عدد الصفحات

0

كلمات الباحثين

Metallic coatings, Composite coatings, Corrosion resistance, Carbon steel, Chromium plating, Silicon carbide, X-ray diffraction, Scanning electron microscope, Erosion-corrosion

إشراف وإعداد

الإشراف

إقبال محمد سعيد صالح, حيدر عبد حسن الجبوري

الإعداد

نذير رزاق علي صالح

الاقتباسات الببليوغرافية