Analysis Of Effect Of Mechanical Properties Of Aluminum Alloy Addition Of Zinc Corrosion Resistance Of Carbon Steel A325 Bolts Process Of Hot Dip Galvanizing
Ery Diniardi, Anwar Ilmar Ramadhan, Hasan Basri
Bolts, A325 carbon steel, Hot Dip Galvanizing, mechanical properties, corrosion rate
The world oil industry are common in offshore areas that are included in a corrosive environment, so that the low-carbon steel bolts A325 will gradually corroded. Therefore, an alternative that can be done to reduce the corrosion rate that is by coating with a Hot dip galvanizing method. The purpose of this study to improve the quality of products from low carbon steel bolts A325 with the addition of Zinc Aluminium alloy on the results of the Hot Dip Galvanizing. Results of testing the hardness of the lowest obtained in quenching time of 30 seconds is 162 037 HVN and the highest hardness obtained on quenching time of 60 seconds is 203 688 HVN. To microstructure shows that the phase Eta which is soft on the surface of the outermost started a little not as much time quenching 30 seconds so that the nature of its decline and violence increased, the phase Zeta that are hard are widely spread meet the layer of phase resulting in hardness of the coating while quenching 45 seconds exceed the hardness of quenching time of 30 seconds. Results of analysis of the rate of corrosion that galvanized coating on each test is different and the structure of ferrite and pearlite, it looks clear. For quenching time of 30 seconds obvious difference in galvanized layer thicker than quenching time of 45 and 60 seconds. This happens because of the influence of factors zinc layer that coats the base material, so that decreased levels of corrosion (%) is comparable to the time Salt Spray Test (SST) performed.
 Hajati, N.L., et al, 2006, Study Effect of Layer Coating Thickness On Corrosion Rate of Concrete, Media Teknik Sipil, pp. 75-81.
 American Galvanizer Association. 2000. Zinc Coating. (On-line) Available at http:// www.migas-indonesia.com
 Indarto, D., 2009, Effect of Hold Time Hot Dipping Process Toward Low Carbon Steel Coating Thickness, Tensile Strength and Price Impact With Aluminum Coating Material, Final Project Undergraduate, Universitas Muhammadiyah Surakarta
 ASM International. 1992. ASM Metals Handbook Vol. 03: Alloy Phase Diagrams. United States: ASM International Handbook Committee.
 ASM International. 1994. ASM Metal Handbook vol.05: Surface Engineering. United States: ASM International Handbook Committee.
 ASTM International. 2002. ASTM Vol 01.06 Coated Steel Products : A123, Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products. United States: ASTM International Committee.
 Galvinfo Center. 2009. Galvinfonote vol.2.4: The role of aluminum in continuous hot dip galvanizing. (On-line) Available at http:// www.galvinfo.com.
 Galvinfo Center. 2009. Galvinfonote vol.3.1: How zinc protect steel. (On-line) Available at http:// www.galvinfo.com.
 International Zinc Association. 2010. Galvanizing. (On-line) Available at http:// www.zincworld.org.
 Robert M. Woods & James A. Cole, 1996. Galvanizing Hanbook. Cleveland, Ohio : Zaclon Incorporated.
 Thomas J., Dr. 2006. Corrosion Protection: Basic corrosion theory and protection methods. American Galvanizers Association.