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2. Pickling (metal) - Wikipedia

   en.wikipedia.org/wiki/Pickling_(metal)

   Hydrochloric acid is more expensive than sulfuric acid, but it pickles much faster while minimizing base metal loss. The speed is a requirement for integration in automatic steel mills that run production at speeds as high as 800 ft/min (≈243 metres/min).

3. Chromate conversion coating - Wikipedia

   en.wikipedia.org/wiki/Chromate_conversion_coating

   For aluminum, the chromate conversion bath can be simply a solution of chromic acid. The process is rapid (1–5 min), requires a single ambient temperature process tank and associated rinse, and is relatively trouble free. [2] As of 1995, Henkel's Alodine 1200s commercial formula for aluminum consisted of 50-60% chromic anhydride CrO

4. Chemical phosphorus removal - Wikipedia

   en.wikipedia.org/wiki/Chemical_phosphorus_removal

   Aluminum sulfate, or "alum" as it is commonly referred, has been found to be an effective lake management tool by reducing the phosphorus load. [2] Sediment core sampled from a Minnesota lake. Aluminum sulfate flocs are depicted as white clumps near the sediment surface. Alum was first applied in 1968 to a lake in Sweden. [2]

5. Brazing - Wikipedia

   en.wikipedia.org/wiki/Brazing

   Acid cleaning bath or mechanical cleaning can be used to remove the oxidation after work. Flux counteracts the oxidation, but may weaken the joint. Combusted fuel gas Low hydrogen, AWS type 1, "exothermic generated atmospheres". 87% N 2, 11–12% CO 2, 5-1% CO, 5-1% H 2. For silver, copper-phosphorus and copper-zinc filler metals.

6. Marinette Yacht - Wikipedia

   en.wikipedia.org/wiki/Marinette_Yacht

   In 1954 George Garcia, owner of Falls City Flying Service, introduced the ‘Marinette’ which was an aluminum houseboat initially built as a twin-hulled cruiser. Choosing to use an aluminum-magnesium alloy, whereas previous attempts at an aluminum watercraft had mainly involved small row boats made of a copper-aluminum alloy , the same ...

7. In-water surface cleaning - Wikipedia

   en.wikipedia.org/wiki/In-water_surface_cleaning

   In-water cleaning, also known as in-water surface cleaning, is a collection of methods for removing unwanted material in-situ from the underwater surface of a structure.. This often refers to removing marine fouling growth from ship hulls, but also has applications on civil engineering structures, pipeline intakes and similar components which are impossible or inconvenient to remove from the ...