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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Bajecne, ani k tomu neni potreba
elektroliza, tak se mi to libi. Bohuzel ty chemikalie budou trosku problem. Jak
to funguje v te firme co je tam uvedena? Prodaji mi treba po 100g? Nebo to
mate odjinud? Jeste by doopravdy neskodila fotografie hotoveho cinovani.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Diky<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Tosa<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> hw-list-bounces@list.hw.cz
[mailto:hw-list-bounces@list.hw.cz] <b><span style='font-weight:bold'>On Behalf
Of </span></b>RV<br>
<b><span style='font-weight:bold'>Sent:</span></b> Wednesday, September 14,
2005 3:23 PM<br>
<b><span style='font-weight:bold'>To:</span></b> 'HW-news'<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: Cinovani DPS</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Tak jsem to nasel ve svem mailovem archivu
(PDF jsem nenasel) - davam to primo do konference muze se to hodit i dalsim
jedincum:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>*******************************************************************************<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>Jak jsem slibil, predkladam novy recept na cinovaci lazen.<o:p></o:p></span></font></p>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>Slozeni je podobne, jako u minule uvedeneho receptu, ale
pozor, hmotnosti jednotlivych chemikalii jsou odlisne.<o:p></o:p></span></font></p>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>Potrebne chemikalie na 1l lazne:<o:p></o:p></span></font></p>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>Chlorid cinaty SnCl2*2H2O 20g<o:p></o:p></span></font></p>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>Thiomocovina CH4N2S 40g<o:p></o:p></span></font></p>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>Kyselina sírová H2SO4 38% (akumulátorová) 1/2 l<o:p></o:p></span></font></p>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>Mnozstvi jednotlivych chemikalii neni nijak kriticke,
odmeroval jsem je malou lopatkou, na niz je napsano 10 ml a to jsem povazoval
za 10g.<o:p></o:p></span></font></p>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>Prvni dve chemikalie lze koupit dobirkou na <a
href="outbind://73/www.lach-ner.cz">www.lach-ner.cz</a>, kyselinu v drogerii.<o:p></o:p></span></font></p>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>Postup michani je uplne jednoduchy:<o:p></o:p></span></font></p>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>1. do 1/2l obycejne vody z vodovodu nasypeme thiomocovinu a
trepanim rozmichame. Idealni je michat v uzavrene PET lahvi, protoze roztok ma
snahu na zacatku zahoustnout (asi jako kysele mleko) a dalsim trepanim zase
zridne. Po zridnuti neni treba cekat na uplne rozpusteni thiomocoviny.<o:p></o:p></span></font></p>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>2. pridame chlorid cinaty a opet promichame. Nechame nekolik
(5) minut ustat.<o:p></o:p></span></font></p>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>3. dolijeme 1/2 litru akumulatorove kyseliny sirove (pozor,
ziravina).<o:p></o:p></span></font></p>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>Promichame.<o:p></o:p></span></font></p>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>A to je vse. Smes je kridove bila, nepruhledna, vznaseji se v
ni nerozpustene zbytky chemikalii. Funguje okamzite.<o:p></o:p></span></font></p>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>Pokud smes nechame den, dva ustat, nerozpustene zbytky
chemikalii se usadi u dna (u cerstve lazne je to zhruba 1/2 objemu).<o:p></o:p></span></font></p>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>Pri cinovani slevam do misky pouze pruzracnou kapalinu
svrchu, ale jen proto, ze je pak dobre videt postup vylucovani cinu.<o:p></o:p></span></font></p>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>Problem puvodni lazne byl, ze jsem se snazil na rady chemiku
(a nenarazim na kolegu Cihelnika, byli to jini) srazeninu z lazne slozite
odfiltrovat a tim jsem nejspise odstranil i prevaznou vetsinu cinu. Pri
pouzivani lazne je totiz dobre videt, jak srazenina ubyva. Podle meho odhadu
ale bude litr teto lazne stacit na 2-<st1:metricconverter ProductID="3 m2"
w:st="on">3 m2</st1:metricconverter> medi, protoze ta, kterou jsem namichal
loni v listopadu, neni jeste ani zdaleka vycerpana. A navic se domnivam
(pokusem jsem zjistil), ze postaci po vycerpani znovu dosypat chlorid cinaty a
thiomocovinu, promichat a muzeme jet dale.<o:p></o:p></span></font></p>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>Aby to ovsem nebylo tak jednoduche, pro kvalitni naneseni
vrstvy cinu je treba povrch medi _dokonale_ odmastit. Me se osvedcilo
odmastovani v 1-3%nim roztoku hydroxidu sodneho (louh) NaOH, coz jsou asi 2
kavove lzicky hydroxidu na 1l vody.<o:p></o:p></span></font></p>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>Odmastuji tak, ze desku ponorim do roztoku hydroxidu, nekolik
minut tam ponecham, pripadne jeste setru stetcem a ihned, _bez oplachovani_, ji
ponorim do cinovaci lazne. K zadne viditelne reakci nedochazi a domnivam se, ze
ani lazen nikterak netrpi. Pracuji za normalni pokojove teploty ve fotomisce.<o:p></o:p></span></font></p>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>Cin se na povrchu desky zacne vylucovat za nekolik sekund,
pouzitelna vrstva je na desce po 1 minute. Ja ale v lazni desky nechavam 5
minut, pak je med vrstvou cinu jiz viditelne zesilena.<o:p></o:p></span></font></p>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>Pokud se po cinovani na povrchu desky vytvori nehezke mapy,
znaci to, ze nebyla odmastena dokonale. Postaci desku znovu omyt v hydroxidu a
dat zpet do lazne.<o:p></o:p></span></font></p>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>Zadne jine zpusoby odmasteni (saponaty, horka voda a para,
prasek, brouseni, lih, aceton, perchloretylen, trichloretylen) mi neprinesly
podobny vysledek.<o:p></o:p></span></font></p>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>Vrstva vylouceneho cinu je krasne leskla a lesk samozrejme
zavisi na kvalite povrchu medi pod cinem. Pokud je deska obrousena hrubym
smirkovym papirem, bude lesk cinove vrstvy hodne zaviset na uhlu pohledu.
Hotovou desku neni treba uz dale nijak povrchove upravovat, ale ja ji jeste
nastriknu vrstvou pajeciho laku Flux SK10 (GMe), ktery pajeni jeste vic
usnadnuje.<o:p></o:p></span></font></p>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>Pro vyrobu PCB pouzivam fotocitlive desky z GM electronic, po
expozici a vyleptani zbyly lak odstranuji prave v roztoku hydroxidu a z nej PCB
prenasim primo do lazne. Zbytky fotocitliveho laku v hydroxidu IMHO nijak
nevadi. Cinovani ale funguje na desky, vyrobene jakymkoli jinym zpusobem.<o:p></o:p></span></font></p>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>Cin se vylucuje na vsech slitinach, obsahujicich med, takze
lze pocinovat mosazne srouby, fastony, pajeci ocka, atd.<o:p></o:p></span></font></p>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>--<o:p></o:p></span></font></p>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>J.R.<o:p></o:p></span></font></p>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>P.S. Pit se to (zatim) neda ... :-))<o:p></o:p></span></font></p>
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