مروری بر نقش نانومواد در بهبود خواص مقاومت به خوردگی پوشش‏های غنی از روی

نوع مقاله : مقاله مروری

نویسندگان

1 کارشناسی ارشد ، دانشکده علوم پایه، گروه شیمی، دانشگاه گیلان

2 استادیار ، دانشکده علوم پایه، گروه شیمی

3 دانشیار ، دانشکده علوم پایه، گروه شیمی، دانشگاه گیلان

چکیده

پوشش‏های غنی از روی، یکی از پرمصرف‏ترین پوشش‏های مقاوم به‏خوردگی در صنایع مختلف به‏شمار می‏روند. در این پوشش‏ها اغلب از درصدهای بالای پودر روی (بالای 90% وزنی در فیلم خشک) به‏منظور حفاظت کاتدی موثر استفاده می‏شود که خود منجر به بروز مشکلات زیادی در این پوشش‏ها از جمله کاهش چسبندگی پوشش به بستر فلز، کاهش خواص فیزیکی و مکانیکی و افزایش گرانروی رنگ می‌شود. به‎منظور کاهش مشکلات یادشده، محققان سعی کرده‏اند تا با جایگزینی مقادیر کمی از پودر روی با نانومواد (2/0 تا  5 درصد وزنی)، هم‏زمان با کاهش درصد پودر روی در این پوشش‏ها، دوره‏ حفاظت کاتدی و همچنین خاصیت حفاظت سدی- فیزیکی را در این پوشش‏ها افزایش دهند. در این مقاله، نانومواد مورد استفاده در پوشش‏های غنی از روی، به 5 دسته کلی طبقه‏بندی شدند و نقش و سازوکار عملکرد هر دسته مورد بررسی قرار گرفت. نانومواد رسانای فلزی (شامل نانوذرات آلومینیم، منیزیم و روی) با افزایش پیوندهای الکتریکی و بهبود محصولات خوردگی عمل می‏کنند. نانومواد رسانای پایه کربنی (شامل نانوذرات کربن سیاه و نانولوله‏های کربنی) موجب افزایش هر دو ویژگی حفاظت کاتدی و حفاظت سدی-فیزیکی در پوشش می‏شوند. پلیمرهای رسانا از جمله پلی‏آنیلین اغلب به‏صورت ترکیب با سایر نانومواد موجب کاهش تخلخل و افزایش رسانایی پوشش می‏شوند. نانومواد نارسانا (شامل نانو رس و نانوهیدروکسیدهای لایه‏ای مضاعف) که تاثیر آنها به‏دلیل افزایش خاصیت سدکنندگی پوشش است و در نهایت، گرافن و مشتقات آن به‏دلیل خواص منحصر به‏فرد خود علاوه بر افزایش رسانایی و خاصیت سدکنندگی، موجب افزایش قابل توجه چسبندگی و مقاومت به جدایش کاتدی می‏شوند.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

A Review on the Role of Nanoparticles in Improvement of Anti-corrosion Properties of Zinc Rich Coatings

نویسندگان [English]

  • Mona Ehsanjoo 1
  • somayeh mohammadi 2
  • Naz Chaibakhsh Langroodi 3
1 Department of Chemistry, Faculty of Science, University of Guilan
2 Department of Chemistry, Faculty of Science, University of Guilan
3 Department of Chemistry, Faculty of Science, University of Guilan
چکیده [English]

Zinc-rich paints are one of the most widely used coatings in various industries. In these coatings, high percentages of zinc powder (over 90% by weight in dry film) uses to provide effective cathodic protection, which can lead to many problems in these coatings: reducing the adhesion of the coating to the metal substrate, reducing the physical and mechanical properties and increasing the viscosity of the paint. In order to reduce the above problems, researchers have tried to replace small amounts of zinc powder with nanomaterials, simultaneously with the reduction of the percentage of zinc powder in these coatings, increase the cathodic protection period as well as the physical- barrier protection properties in these coatings. In this paper, the used nanomaterials in zinc-rich coatings were classified into five general categories and the role and mechanism of performance in each category were investigated. Metallic conductive nanomaterials (including aluminum, magnesium and zinc nanoparticles) with increasing electrical connections and improving corrosion products. Carbon-based conductive nanomaterials (including carbon black nanoparticles and carbon nanotubes) that enhance both cathodic protection and physical-barrier protection properties. Conductive polymers, including polyaniline, are often combined with other nanomaterials, reducing porosity and increasing the conductivity of the coating. Nonconductive nano materials (including nano-clay and layered double hydroxide) that their effect is due to the increased barrier properties of the coating and finally, graphene and its derivatives, due to their unique properties in addition to increasing the conductivity and the barrier properties, significantly increase the adhesion and cathodic delamination resistance.
 

کلیدواژه‌ها [English]

  • Nanomaterials
  • Zinc-rich coating
  • Cathodic protection
  • Barrier protection
  • Carbon steel

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  • تاریخ دریافت: 12 تیر 1398
  • تاریخ بازنگری: 01 مهر 1398
  • تاریخ پذیرش: 02 مهر 1398

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