Tinning processes Tinning

-


in electroplating, item coated placed container containing solution of 1 or more tin salts. item connected electrical circuit, forming cathode (negative) of circuit while electrode typically of same metal plated forms anode (positive). when electric current passed through circuit, metal ions in solution attracted item. produce smooth, shiny surface, electroplated sheet briefly heated above melting point of tin. of tin-plated steel made today further electroplated thin layer of chromium prevent dulling of surface oxidation of tin.







Comments

Post a Comment

Popular posts from this blog

Expenses controversy Ian Gibson (politician)

-
in may 2009, gibson became embroiled in mps expenses scandal detailed daily telegraph, reported claimed flat in daughter lived rent-free before selling half market value. subsequently, barred standing in next general election disciplinary panel of labour party. believing after panel s decision position untenable , resigned mp (by traditional procedural device of becoming crown steward , bailiff of 3 chiltern hundreds of stoke, desborough , burnham), thereby forcing by-election. resultant by-election won chloe smith, conservative party candidate, majority of 7,348, reversing previous labour majority of 5,459.
Read more

Mobility.2C training and insignia Impi

-
zulu warrior in full regimental regalia, carrying large isihlangu war shield. c. 1860. upper body covered in cow tails, kilt of spotted cat, genet or civet skin , shins decorated cowtails. elaborate headdress consists of browband , face-framing flaps of leopard skin band of otter skin above. there multiple ostrich feather plumes , single upright crane s feather. shaka discarded sandals enable warriors run faster. move unpopular, objected killed, practice concentrated minds of remaining personnel. zulu tradition indicates shaka hardened feet of troops having them stamp thorny tree , bush branches flat. shaka drilled troops frequently, implementing forced marches covering more fifty miles day. drilled troops carry out encirclement tactics (see below). such mobility gave zulu significant impact in local region , beyond. upkeep of regimental system , training seems have continued after shaka s death, although zulu defeats boers, , growing encroachment british colonists, sharply curtailed r
Read more

11th century parish church of St Leonard Hythe, Kent

-
st. leonard s church shelf containing skulls in ambulatory below chancel, commonly inaccurately described crypt. the large 11th century church hill; tower @ eastern end destroyed earth tremor in 1739 , restored in 1750. chancel, 1220, covers processional ossuary (a bone store, more commonly found on continent) lined 2,000 skulls , 8,000 thigh bones. date medieval period, having been stored after removal, make way new graves. common in england, bones dispersed, , rare collection. several of skulls show marks of trepanning. 1 of 2 surviving ossuaries in england; other in holy trinity church in rothwell, northamptonshire. other curiosities worth looking for. on pillars on south side of nave medieval graffiti depicting ships. vestry door, on north side of nave, unlocked; open see fine norman doorway. has been suggested this, in late medieval times apparently on outer wall of church, once internal wall, earlier norman church stage higher hill. make existing chapel of st edmund (or north tra
Read more