Abstract:
Anti-corrosion nanoparticle compositions include a carrier and a plurality of nonionic metal nanoparticles. The metal nanoparticles can be spherical-shaped and/or coral-shaped metal nanoparticles. The nanoparticles are selected so as to locate at the grain boundaries of a metal or metal alloy when the anti-corrosion composition is applied to the metal or alloy, thereby reducing or preventing intergranular corrosion of the metal or alloy.
Abstract:
In a method of corrosion protection of rebar in concrete the sacrificial anode is held in place by wrapping a first wire around a first rebar portion and a second wire at second rebar portion and twisting together the first and second free ends to tension the wrappings. This can be used either on two separate rebars which are parallel or at right angles or can be used at longitudinally spaced positions on a single rebar where the rebar roughening prevents the two wrappings from sliding as the wires are tensioned by the twisting. In many cases a covering material such as a porous mortar is cast onto the outer surface of the anode and in this case the mortar and the wire are located such that the wire exits from the sacrificial anode at a position separate from the layer of covering material and an insulated spacer can be provided to prevent direct electrical connection with the rebar.
Abstract:
The invention relates to a hydraulic binding agent, comprising K, Ca, aluminosilicates and optionally Li, Na, and MG, characterized in that it comprises the following constituents: a) latent hydraulic aluminosilicate glass at a ratio of (CaO+MgO+AI2O3)/SiO2 > 1 and b) alkali activator of the empirical formula (I): a(M2O) * X(SiO2) * y(H2O), where M = Li, Na, K, a = 0-4 and x = 0-5 and y = 3-20, wherein the mol ratio Ca/Si 0.1. The invention further relates to binding agent matrixes, to mortar, to concrete adhesive and to metal anodes produced from said binding agent.
Abstract:
An electrolytic mortar for fabricating galvanic anode panels is strengthened with fibers to improve green strength and resistance to cracking. Elongated reinforcing fibers are introduced into a flowing stream of mortar and deposited in multiple layers upon a platen or mold. A sacrificial zinc anode of open construction is embedded between the multiple layers to allow for electrolytic conduction between the layers and over all surfaces of the zinc anode.
Abstract:
The present invention describes a corrosion control electrolyte coating system and methods to protect steel surface above ground and off-shore facilities from rusting and corrosion, wherein the steel surface is exposed to the atmospheric environment and coated by a transparent, ionically conductive, and dried layer or film. The system mainly made of four elements i.e. an anode, an electrolyte connected to the anode by an conductive adhesive, a power source e.g. DC power source, and a metal structure to be protected from corrosion, or rusting due to environment or atmospheric factors. The electrolyte used in the present system further comprises a highly ionically conductive & hydrophilic fluoropolymer resin having anti-cracking properties. The coating liquid can be applied easily onto the metal structure above the ground just like ordinary paints and functions well as an electrolyte of the cathodic protection. The coating liquid applied on the metal surface leads to the realization of the cathodic protection of the ground.
Abstract:
A method of using an activator in a compact discrete sacrificial anode assembly that is assembled within an anode cavity in concrete is described. The method includes providing a sacrificial anode, and an activator to activate the sacrificial anode, and a backfill to embed the sacrificial anode and the activator in an anode cavity in the concrete. The activator is provided as a discrete contained unit for dispersion through the backfill to surfaces of the sacrificial anode, and the unit at least in part separates the activator from any electrolyte in contact with the sacrificial anode. The activator is separated from the backfill prior to use. The advantages of this invention include limiting corrosion of the sacrificial metal element prior to use, containment of the health and safety risk presented by an activator, and providing a facility to control the quantity of activator installed in a sacrificial anode assembly. A surprising benefit results from a transient increase in the temperature of the assembly.
Abstract:
An anode assembly and method for installing it in a cathodic protection system for an aboveground storage tank is disclosed. The anode assembly basically comprises an elongated electrically conductive anode, a fabric housing and sand backfill. The fabric housing is a hollow member in which the sand is located and through which the anode extends. The anode includes portions extending out of the housing for connection to the cathodic protection system. The anode assembly is arranged to be installed on a flat prepared surface below the bottom of the storage tank, whereupon the anode assembly's weight hold it flat on that surface without the need for staking or other means to hold the assembly flat. The ground with the anode assembly can then be backfilled to the level of the bottom of the storage tank.
Abstract:
A hybrid sacrificial galvanic anode, an anodic system including the hybrid sacrificial anode, and a method of cathodically protecting steel reinforcement in concrete structures is provided. The hybrid anode provides initial steel polarization followed by long term galvanic protection without the use of batteries or external power supplies.