Rust paint a detailed description

Can delay or prevent the occurrence of chemical or electrochemical corrosion of metal of a class of pigments. Mainly used for the preparation of anti-rust primer. Such as red lead (PbO), is an ancient, mainly anti-rust paint, but due to cause lead poisoning, the dosage gradually reduced. Rust paint protective effect of metal objects, some physical effects, some chemical or electrochemical action. A pigment may also be from the same two or more protective effect, but only in the preparation of anti-corrosive coating and after coating on the metal surface can be achieved. In addition to the main varieties of red lead, there are the following:Metal soap
Lead-acid calcium 2CaOPbO, with red lead have similar chemical structure. This is in the early 1950s trying to find a low lead content, similar to rust red lead of alternative materials research. Cream colored powder, relative density 5.71, 59% lead content. Mainly used for the preparation instead of red lead rust. Lead-acid calcium is calcium oxide or calcium carbonate and lead oxide high-temperature reaction at 700 ℃ for and made.
Silicon basic lead chromate pigment one kind of packet core, the core part of the SiO, surface part of the [kg1] PbCrOPbO and PbSiO3PbO. I.e. silica particles as the core, is generated on the surface of basic tribasic lead chromate and lead silicate-γ-, orange-yellow powder, 43% lead. This is the 20th generation of the 1960s developed rust red lead pigment production method is based on fine silica powder (silica) as the core, lead oxide and chromate acting on the particle surface, generate a basic chromium lead acid (PbCrOPbO and [kg1] PbCrO4PbO) precipitation. After calcination, quartz powder particles on the surface of the formation of a precipitate with PbCrOPbO and PbSiO3PbO firm envelope. Zinc chrome yellow approximate composition [kg1] KO4ZnO4CrO3HO. It has a certain solubility in water, can release hexavalent chromium ions, the metal surface passivation of the anode, to prevent rusting of metal. Commonly used in the preparation of zinc yellow rust primer for protection of steel and light metals. It is made of a fine zinc oxide slurry, and then add the reaction from chromic acid or dichromate.
Four base zinc yellow approximate composition of 4Zn (OH) ZnCrO, water solubility lower than zinc chrome yellow, CrO content of 17%. Commonly used in the preparation of phosphate primer. Four zinc yellow base is made of a fine zinc oxide slurry by adding a certain amount of chromic acid by reaction. Strontium is mainly composed of chrome yellow strontium chromate (SrCrO), and lemon yellow. Water solubility than four base rather than zinc yellow zinc chrome yellow, CrO content of up to 49%. Light metals used in the preparation of protective primer. Since the ability of high temperature 400 ℃, can be used for plastic coloring. Chrome yellow Strontium chromate is sodium nitrate, strontium nitrate and reacting the resulting precipitate.PVC flame retardant