Provided is an aluminum alloy fastening member having a novel chemical conversion coating as a colored coating, a fastener chain, and a method for producing the aluminum alloy fastening member. The aluminum alloy fastening member includes a chemical conversion coating containing manganese as a component element, and the chemical conversion coating satisfies hue ranges of −3≤a*≤12, −5≤b*≤35, and 45≤L*≤80 in a CIELAB color space as defined by JIS Z 8781-4 (2013).

Disclosed is a system for treating a surface of a multi-metal article. The system includes first and second and/or third conversion compositions for contacting at least a portion of the surface. The first conversion composition includes phosphate ions and zinc ions and is substantially free of fluoride. The second conversion composition includes a lanthanide series metal cation and an oxidizing agent. The third conversion composition includes an organophosphate compound, an organophosphonate compound, or combinations thereof that optionally may include at least one transition metal. Methods of treating a multi-metal article using the system also are disclosed. Also disclosed are substrates treated with the system and method.

Disclosed is a system for treating a surface of a multi-metal article. The system includes first and second and/or third conversion compositions for contacting at least a portion of the surface. The first conversion composition includes phosphate ions and zinc ions and is substantially free of fluoride. The second conversion composition includes a lanthanide series metal cation and an oxidizing agent. The third conversion composition includes an organophosphate compound, an organophosphonate compound, or combinations thereof that optionally may include at least one transition metal. Methods of treating a multi-metal article using the system also are disclosed. Also disclosed are substrates treated with the system and method.

Described are aluminum alloy products that generally have a microstructure and composition that resists corrosion. This corrosion resistance, in turn, allows the aluminum alloy products to exhibit favorable bond durability performance, such as when adhesively bonded to another product. The corrosion resistance can be achieved by controlling the composition of the aluminum alloy, including the presence and/or concentration of certain intermetallic particles, such as α-phase intermetallic particles and β-phase intermetallic particles.

Aluminum alloy products having a bulk and a micro-grained subsurface structure are described. The aluminum alloy products may exhibit superior bonding character and may comprise or have a silicon-containing layer thereon. The bulk may include a matrix including grains of an aluminum alloy and may comprise aluminum and one or more alloying elements such as zinc, magnesium, copper, chromium, silicon, iron, or manganese. The micro-grained subsurface structure may be substantially devoid of one or more defects (e.g., voids, transfer cracks, or fissures) or organics, oils, hydrocarbons, soils, inorganic residues, rolled-in oxides, or anodic oxides, which may commonly be present in rolled near-surface microstructures. The micro-grained subsurface structure may include or have thereon a first oxide layer having a thickness of from 1 nm to 20 nm. Methods of making aluminum alloy products are also described.

A heat exchanger and a processing method of heat exchanger. The heat exchanger includes a collecting pipe, a fin and a number of heat exchange tubes. The heat exchange tubes are fixed with the collecting pipe. At least part of the fin is fixed between two adjacent heat exchange tubes. The heat exchanger includes a coating with a first matching coating which is in direct contact with at least one of the collecting pipe, the heat exchange tubes and the fin; or, at least one functional films is further spaced between the first matching coating and at least one of the collecting pipe, the heat exchange tubes and the fin. The first matching coating includes a hydrophobic material and a filler of nanoparticle type.

Described herein is a continuous coil pretreatment process used to treat the surface of an aluminum alloy sheet or coil for subsequent deposition of an acidic organophosphorus compound. The process can include applying a cleaner to a surface of an aluminum sheet or a coil; etching the surface of the aluminum sheet or the coil with an acidic solution; rinsing the surface of the aluminum sheet or the coil with deionized water; applying to the surface of the aluminum sheet or the coil a solution of an acidic organophosphorus compound; rinsing the surface of the aluminum sheet or the coil with deionized water; and drying the surface of the aluminum sheet or the coil.

Described herein is a continuous coil pretreatment process used to treat the surface of an aluminum alloy sheet or coil for subsequent deposition of an acidic organophosphorus compound. The process can include applying a cleaner to a surface of an aluminum sheet or a coil; etching the surface of the aluminum sheet or the coil with an acidic solution; rinsing the surface of the aluminum sheet or the coil with deionized water; applying to the surface of the aluminum sheet or the coil a solution of an acidic organophosphorus compound; rinsing the surface of the aluminum sheet or the coil with deionized water; and drying the surface of the aluminum sheet or the coil.

Provided is an aluminum alloy fastening member including a chemical conversion coating having a novel composition as a colored coating, and a method for producing the aluminum alloy fastening member. The aluminum alloy fastening member includes a chemical conversion coating containing tellurium as a component element.

Provided is an aluminum alloy fastening member including a chemical conversion coating having a novel composition as a colored coating, and a method for producing the aluminum alloy fastening member. The aluminum alloy fastening member includes a chemical conversion coating containing tellurium as a component element.