COATING NIAL ON STAINLESS STEEL 304 FOR INCREASED CORROSION RESISTANCE IN HEAT TRANSFER FLUID PIPE ON CONCENTRATED SOLAR POWER

• Main Author: Lahan Asawan, Esa
• Format: Theses
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/70101
• Institution: Institut Teknologi Bandung

Concentrated Solar Power (CSP) is one type of solar power plant that is developing and widely used. The heat energy from the sun will be carried by the solar salt on the Heat transfer fluid (HTF) to evaporate water on steam. This water vapor will be used to drive a generator to produce electricity. NaNO3 – KNO3 is the most widely used type of solar salt. Solar salt has very corrosive properties at high temperatures. Nickel based alloys are generally used as structures for HTF components because they have good corrosion resistance to solar salt. However, nickel alloys are much more expensive than Fe based metal materials. Stainless steel 304 is the most developed material to be used as a component of HTF in CSP. Coating is a method that is widely proposed to increase the corrosion resistance of materials in a solar salt environment. In this research, the coating process on stainless steel 304 substrate material will be carried out as a cheaper alternative to material on HTF pipes in CSP installations. The process of coating NiCrAlY powder as a bond coat and NiAl powder as a top coat material was carried out using the Mechanical Alloying (MA) method using a planetary ball mill. NiAl coating on SS 304 can increase corrosion resistance in the CSP solar salt environment. The value of weight loss on raw material after immersion test for 100 hours at a temperature of 600C is 0.004 grams can be reduced to 0.0018 grams on a MA 2 hours coating and -0.001 grams (weight gain) on a MA 8 hours coating.