Help needed regarding updates on sacrificial anodes
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This post was last edited by “Partings and Goodbyes” on August 3, 2009, at 17:43. Among the many parameters related to sacrificial anodes, the protection current is one such parameter. For instance, for aluminum-zinc-indium sacrificial anodes, the protection current for steel is generally taken as 0.3 A/M². When calculating the current intensity, should the area used in the calculation be the surface area of the sacrificial anode or the area that needs to be protected? When specifically calculating the mass as well as the length, width, and height of the anode that needs to be sacrificed, it is still necessary to determine these values based on the specific type of steel to be protected, its dielectric resistance, and its corrosion potential, right? So what’s the use of this protection current data?
The data that needs to be obtained is the area to be protected. The client must first understand that there are two methods of cathodic protection: sacrificial anode method and forced current method. There are specific standards for the specifications of sacrificial anodes, namely GB/T4948-2002, which provides detailed information on such specifications. Only when the required protection current is achieved can the sacrificial anode function effectively to protect the area that needs to be safeguarded
This post was last edited by “Parting Comes, Parting Goes” on August 4, 2009, at 12:07. I really don’t know much about this... Currently, I’m trying to learn it by myself. However, there aren’t any suitable textbooks available. I’ve downloaded dozens of related papers online, but after reading them, I still have many gaps in my understanding. (Edit: This standard has been found, but I plan to use a bracelet-shaped sacrificial anode in my design, and it’s not mentioned in the standard.) Could you also recommend some books on sacrificial anodes or cathodic protection?~
Can it be understood that, for example, if I want to design protection for a pipe with a length of L, and if a sacrificial anode can cover an area of S, then for aluminum-zinc-indium sacrificial anodes used to protect stainless steel, the current required is 0.3 A/M2. Using this value, it’s possible to calculate the mass of the anode needed for 3 years of protection, thereby determining the geometric dimensions of the sacrificial anode； At the same time, the length that can be protected by a sacrificial anode is determined, thereby allowing the calculation of the number of sacrificial anodes required. So how is the area S that can be protected by this sacrificial anode determined?
We have a seawater pretreatment project in which the outlet pipes are made of 800-mm iron tubes; they were originally lined with plastic. However, over time as these pipes were left outside, the plastic lining came off. Now that the project is in operation, the lining has fallen off after two years. We are considering using sacrificial anodes as a solution, and any manufacturers specializing in this area can contact me at QQ61603504