A pipe (10) includes a polyethylene-based resin layer (21) containing a polyethylene-based resin composition as a major component. The polyethylene-based resin layer (21) forms a pipeline member inner surface (10a). The polyethylene-based resin composition has a calcium concentration of 10 ppm or more and 60 ppm or less.

An electrochemical method for field monitoring of protective properties of organic coatings in seawater environment includes: Step 1: Determine the actual service environment of the coating structure and prepare the simulated electrolyte solution. Step 2: Select the anode block for testing. Step 3: Test the corrosion current and potential of the coating structure under different manual peeling areas. Step 4: Fit the peeling area model of organic coating. Step 5: Real-time monitoring of the actual service coating peeling area.

Through the method, we reached to map the deteriorating state of the organic coating to metal substrate for coating on the activity of area of the effect of stripping state recognition, resolved to organic anticorrosive coating anticorrosion performance timely and accurate assessment of the actual problem, achieved by monitoring the anode current to evaluate the organic coating stripping area. This method is scientific and has good technics and broad application value.

A coating composition comprising an oxidized α-olefin having 16 to 40 carbon atoms and one or more carboxylic acid or ester groups; a hydrocarbon-soluble ester-containing polymer having at least one branch of 10 to 36 carbon atoms and having a number average molecular weight of 5000 to 300,000; a carboxylic acid of at least 10 carbon atoms; a salt of an alkylarylsulfonic acid; an oil in an amount sufficient to dissolve said metal salt; and optionally, a volatile diluent, provides good rust protection.

Method for preparation of 5-alkylsalicylaldoximes with formula 1, where R is a C6-C16 alkyl group, consisting in that into a water-alcohol solvent system, p-alkylphenol, sodium hydroxide, chloroform and hydroxylamine are introduced, while in relation to the alkylphenol used, sodium hydroxide and chloroform are used in amounts from the stoichiometric amount to a 100% excess, and hydroxylamine is used in amounts from the stoichiometric amount to a 60% excess, and the reaction is carried out at a temperature of 60-75° C. for 1.5-4 h, and then, at a temperature of 20-30° C., the post-reaction mixture is acidified till the pH of the aqueous phase <7.0 is obtained, and next, an alcohol-water azeotrope is distilled off with an admixture of unreacted chloroform, the residue is mixed with a neutral C5-C10 hydrocarbon solvent, the layers are separated, and the solvent is distilled off from the organic phase.

A coating composition and a method for coating metallic substrates, such as aircraft components exposed to elevated temperatures and/or oxidative conditions. The coating composition includes an aqueous mixture having about 2 vol % to about 50 vol % organosilane, about 0.3 to about 25 vol % metal alkoxide, and about 0.1 to about 30 vol % organic complexing agent. The coating composition may be deposited on a metallic substrate and cured to form a sol-gel coating on the surface of the substrate that is adherent to the substrate, and oxidation and discoloration resistant.

The present invention relates to mesostructured particles that have the particular property of being spontaneously individualized, and that include anticorrosion agents. The invention also relates to a process for preparing these particles, and also to materials obtained by inclusion of these particles in matrices.

A corrosion inhibiting composition which is a liquid carrier in which is dissolved or dispersed a corrosion inhibitor compound comprising at least one moiety (A) which is an aliphatic, aromatic or mixed aliphatic/aromatic structure containing one or more hetero atoms which are nitrogen, oxygen, phosphorus or sulphur, and also at least one moiety (B) which contains one or more polymerisable groups containing double or triple bonded carbon, with the moieties (A) and (B) directly or indirectly covalently connected together.

A chemical conversion-treated steel pipe has a chemical conversion treatment film on a plated layer on a steel sheet. The plated layer is configured from a zinc alloy comprising 0.05-60 mass % aluminum and 0.1-10.0 mass % magnesium. The chemical conversion treatment film contains a fluorine resin, a base resin, metal flakes and a chemical conversion treatment component. The base resin is one or more selected from a group consisting of polyurethane, polyester, acrylic resins, epoxy resins and polyolefin. The content of fluorine resin with respect to the total amount of fluorine resin and base resin is at least 3.0 mass % calculated as fluorine atoms. The content of the base resin with respect to 100 parts by mass of the fluorine resin is at least 10 parts by mass. The content of metal flakes in the chemical conversion treatment film is greater than 20 mass % up to and including 60 mass %.

Processes, compositions and agents are included for inhibiting corrosion in various substrates, for example metal substrates. Corrosion inhibitors include organometallic polymers such as metal-organic frameworks (MOFs), including compositions and processes comprising MOFs for inhibiting corrosion in metal substrates. In some aspects, a method of protecting a substrate from corrosion includes applying a protective composition including a corrosion inhibitor to the surface of a substrate, where the corrosion inhibitor includes a metal organic framework (MOF).

Inadvertent or unavoidable contact of an acid with an acid-reactive substance may preclude the acid's use in another location where its reactivity is more desired. Excessive reactivity of acids toward acid-reactive substances may lead to undesired effects such as surface erosion, matrix deconsolidation, scaling, and the like. Methods for protecting an acid-reactive surface from excessive reaction may comprise: depositing a protective coating comprising an N-(phosphonoalkyl)iminodiacetic acid or any salt thereof onto an acid-reactive surface; and contacting a mineral acid or an organic acid with the protective coating without substantially reacting the acid-reactive surface.