Fasteners - hdgasa

Duplex FeatureThe hot debate considering the effectiveness ofcathodic protection provided by either a metalliccoating or a zinc rich paint continues...We refer to the article “How to selectzinc silicate primers” presented byInternational Protective CoatingsAkzo Nobel, as submitted by RobWatson of International Paint(Durban) and wish to respectfullycomment as follows:We stated in our original responseregarding the Cathodic Protection (CP)benefits using Zinc rich paints that“Cathodic Protection (CP) is somewhatcomplex, especially if one is to demonstrate thepracticalities of inorganic zinc dust providingCP when applied to a steel surface. Importantaspects such as Anode Loading (the amount ofcurrent being drawn from the zinc), the circuitresistance between the zinc, steel and moistureTypical section through a zinc rich paint layer.via the epoxy paint, the anode capacity (howmuch current can be delivered for a specifictime duration), etc all play a significant role.The matter is further exacerbated by thepresence and/or absence of film formingproducts in the electrolyte (moisture), pH,temperature, etc.”The very first rule of CP that oneneeds to understand, is as follows: Inorder for CP to work, you need ananode (zinc), a cathode (steel surface)and an electrolyte (water). Theelectrolyte is required in order topermit the flow of current, therebyCBT (011) 868-3408 DC1022/10/05Specialists in the preparation and painting of hotdip galvanized steel, sweep blasting, abrasiveblasting, tank linings and industrial paintingContact Mike BookTel.: (011) 827-4221 • Fax: (011) 827-4561Cell: 072 782 8853 • Email: bulldogproj@murrob.comP.O. Box 82741 Southdale 2135Genrec Office Park, Cnr Dekema & Nieman Rd,WadevilleSave the surface... and you save allVolume 3 Issue 4 2006 Hot Dip Galvanizing Today 31