7075

©Directorate of Technical Development. ®Unificazione Nazionale Italiana. ® Una Norma Espanol.

© Verein Schweizerischer Maschinenindustrieller. 1(1 International Organization for Standardization.

Source: Aluminum Association [5, 6]. ©Austrian Standard M3430. © Canadian Standards Association. © N ormes Françaises. © Deutsche Industrie-Norm. © Werkstoff -Nr. © British Standard.

©Directorate of Technical Development. ®Unificazione Nazionale Italiana. ® Una Norma Espanol.

© Verein Schweizerischer Maschinenindustrieller. 1(1 International Organization for Standardization.

Source: Aluminum Association [5, 6]. ©Austrian Standard M3430. © Canadian Standards Association. © N ormes Françaises. © Deutsche Industrie-Norm. © Werkstoff -Nr. © British Standard.

Some alloys are provided with a thin coating of pure aluminum or corrosion-resistant aluminum alloy (such as 7072); the resulting product is called alclad. This cladding is metallurgically bonded to one or both sides of sheet, plate, 3003 tube, or 5056 wire, and may be 1.5-10% of the overall thickness. The cladding alloy is chosen so it is anodic to the core alloy and so protects it from corrosion. Any corrosion that occurs proceeds only to the cladding-core interface and then spreads laterally, making cladding very effective in protecting thin materials. Because the coating generally has a lower strength than the base metal, alclad alloys have slightly lower strengths than nonalclad alloys of the same thickness. Alloys used in clad products are given in Table 9.4.

9.1.3.2 Cast Alloys

Casting alloys contain larger proportions of alloying elements than wrought alloys. This results in a heterogeneous structure that is generally less ductile than the more homogeneous structure of the wrought alloys. Cast alloys also contain more silicon than wrought alloys to provide the fluidity necessary to make a casting.

w TABLE 9.4 Components of Clad Products

Component Alloys©

Designation Core Cladding

Alelad 2014 Sheet and Píate 2014 6003

Alelad 2024 Sheet and Píate 2024 1230

1±% Alelad 2024 Sheet and Píate 2024 1230

Alelad One Side 2024 Sheet and Píate 2024 1230

1 \% Alelad One Side 2024 Sheet 2024 1230 and Píate

Alelad 2219 Sheet and Píate 2219 7072

Alelad 3003 Sheet and Píate 3003 7072

Alelad 3003 Tube 3003 7072

Alelad 3004 Sheet and Píate 3004 7072

Alelad 5056 Rod and Wire 5056 6253

Alelad 6061 Sheet and Píate 6061 7072

Cladding Thickness per Side Percent of Composite Thickness

Total Specified Thickness of Composite Product (in.)

Sides clad

Nominal

Averaged) min. max.

Up thru 0.024

Both

0 0

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