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FAQ

When Aluminium nitrate is heated , i got yellow amorphous solid which did not not melt on further heating. What compound is that?

Aluminium nitrate follows the rules for metal nitrate decomposition. Group I nitrate Na K etc --- nitrite + oxygen Other metal nitrate --- Metal Oxide + nitrogen dioxide + oxygen So your final product is aluminium oxide.

Certainly, aluminum sheet finds utility in marine environments. The corrosion resistance exhibited by aluminum renders it a favored material for marine purposes. The formation of a safeguarding oxide layer on its exterior effectively curbs corrosion, even in the presence of saltwater. Moreover, aluminum's lightweight nature qualifies it as an optimal selection for marine applications where weight reduction is paramount. Given its robustness, strength, and corrosion resistance, aluminum sheet is extensively employed in boat hulls, decks, and various other marine constructions.

Aluminum sheets do not possess notable electrical insulation properties. Being a highly conductive metal, aluminum enables the easy flow of electric current. Consequently, effective electrical insulation cannot be attained with aluminum sheets. In situations where electrical insulation is necessary, alternative materials like plastics or ceramics would be more appropriate choices.

There are several different types of surface treatments available for aluminum sheets, each serving a specific purpose and providing unique characteristics. Some of the most common surface treatments for aluminum sheets include anodizing, painting, powder coating, and polishing. Anodizing is a process that involves the formation of a thick oxide layer on the surface of the aluminum sheet. This treatment not only enhances the appearance of the sheet by providing a variety of colors, but also improves its corrosion resistance and durability. Anodized aluminum sheets are widely used in architectural applications, automotive parts, and electronics. Painting is another popular surface treatment for aluminum sheets. It involves applying a layer of paint on the surface to enhance its appearance and provide additional protection against corrosion and wear. Painted aluminum sheets are commonly used in signage, building facades, and decorative applications. Powder coating is a type of surface treatment that involves applying a dry powder to the aluminum sheet and then heating it to create a protective layer. This treatment offers excellent durability, resistance to weathering, and a wide range of color options. Powder coated aluminum sheets are commonly used in the construction industry, as well as for automotive parts and appliances. Polishing is a surface treatment that involves buffing the aluminum sheet to create a smooth and reflective surface. This treatment enhances the aesthetics of the sheet, making it ideal for decorative applications such as furniture, jewelry, and architectural accents. Overall, the choice of surface treatment for aluminum sheets depends on the desired appearance, functionality, and application requirements. Each treatment offers unique benefits and characteristics, allowing for versatility and customization in various industries.

The density of 101 aluminum sheets cannot be determined without knowing the dimensions and weight of each individual sheet.

The reflectivity of aluminum sheets is quite high, typically ranging from 80% to 95%, which makes them excellent for various applications that require high levels of reflection, such as mirrors, solar panels, and decorative surfaces.

Aluminum sheets are typically measured and specified based on their thickness, width, and length. The thickness is commonly expressed in gauge or millimeters, while the width and length are provided in inches or millimeters. Additionally, the alloy composition and temper of the aluminum sheet may also be specified to meet specific requirements.

I have a problem when machining aluminium in my machine shop. There are times when the machines aluminium surface turns yellowish (somtimes brown). I do not know what is the main cause of the problem. Is it due to the coolant used?

Aluminum oxides may appear in different colors depending on hydration states and other variables. Look in a CRC Handbook of Chemistry Physics if available for aluminum compounds and their colors. The colors that you see may also have as much to do with the surface finish as the color of the material on the surface. A microscopically rough surface will appear dark next to a polished surface due to light scattering. I will agree with Ling in principle, but not on details. EDS detection limits on homogeneous samples can be better than 0.1%, although not so good for elements at the light end of the detection range. Current detectors can detect chlorine (a common culprit for aluminum discoloration) at about 0.1%. Your problem with detection and one that Ling has addressed previously may be that a thin film of contamination would not be easily detected by EDS. As Ling suggests, SIMS is a good technique for detecting thin films and low concentrations. The problem with SIMS in this case may be that the detection limits are too good and the technique cannot be quantified. SIMS would detect 2 ppm of chloride and you couldn't tell for sure whether it was 2 ppm, which is probably not an issue here, or 2000 ppm, which would be significant. I would suggest x-ray photoelectron spectroscopy (ESCA or XPS) as an alternative for further study. The technique will analyze thin films (20 A) and detection limits are good enough (about 0.1%). In addition, XPS will give you information about the compounds present, e.g. whether the oxygen is aluminum oxide, aluminum hydroxide, etc. Good Luck.