Uravnavanje vsebnosti železa v Zn-fosfatni kopeli med procesom Zn-fosfatiranja

diplomsko delo visokošolskega strokovnega študijskega programa I. stopnje

Matej Stupan (Author), Mojca Slemnik (Mentor), Andreja Goršek (Co-mentor)

Abstract

Namen diplomskega dela je bil uravnavati vsebnost železa med procesom cink-fosfatiranja v cink-fosfatni kopeli s temperaturo 55°C in pH 2. Cink-fosfatna prevleka se uporablja kot porozen medij in na surovcu služi kot podlaga, na katero se nanese milo. Milo deluje kot mazalno sredstvo pri hladnem preoblikovanju na stiskalnici, saj olja zaradi svojih fizikalnih lastnostih niso primerna in bi v najslabšem primeru lahko prišlo do zvara med orodjem in obdelovalcem. Prevleka ima značilno sivo barvo, po kateri se lahko tudi piše. Zaradi prevelike vsebnosti železa prihaja do napak pri nadaljnjih postopkih hladnega preoblikovanja na stiskalnicah. Obdelovanci imajo optimalne lastnosti pri koncentraciji železa okoli 4 g/L. Pri koncentracijah višjih od 7 g/L je potrebno fosfatno kopel izprazniti in nastaviti novo. Pri tem se pojavijo dodatni stroški, saj se celoten proces zaustavi, potreben je nakup novih kemikalij in obdelava odpadnih voda na čistilni napravi. Namen dela je bil uravnati koncentracijo železa na želen nivo. S tem bi dosegli višjo kvaliteto polizdelkov in znižali stroške za nakup kemikalij. Proces proizvodnje bi potekal brez večjih prekinitev, saj je pri previsoki koncentraciji potrebno fosfatno kopel prečrpati v čistilno napravo in nastaviti novo. S predlagano metodo bi se zmanjšal strošek čistilne naprave za obdelovanje težkih kovin, hkrati bi doseli nižjo stopnjo onesnaženosti reke z izpusti.

Keywords

cink-fosfat;železo;površinska zaščita;fosfiranje;

Data

Language:	Slovenian
Year of publishing:	2015
Typology:	2.11 - Undergraduate Thesis
Organization:	UM FKKT - Faculty of Chemistry and Chemical Engineering
Publisher:	[M. Stupan]
UDC:	543.635.4(043.2)
COBISS:	19330326
Views:	1052
Downloads:	113
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Adjusting the iron content in Zn-phosphate bath during the process of Zn-phosphating
Secondary abstract:	The purpose of our thesis was regulation of the iron content, during the process of zinc-phosphating, in the zinc-phosphate bath with a temperature of 55°C and pH 2. Zinc-phosphate coating is used as a porous medium on the work piece of material intended for processing or treatment, and serves as grounding on which soap is applied. During cold forming on the press, soap acts as a lubricating agent, because oils are unsuitable, due to their physical properties. In the worst case, this could lead to the welding between the tool and the processors. The coating is in its standard grey color and it can be written on. In further proceedings of cold forming on the presses errors occur, due to excessive iron content. Work pieces have optimal characteristics at a concentration of iron around 4 g/L. At concentrations higher than 7 g/L phosphate bath needs to be emptied and a new one has to be placed. In such cases additional costs occur, because the whole process is stopped, the purchase of new chemicals is required and a treatment of waste waters at the treatment plant. The purpose of the work was to balance the concentration of iron on the desired level. With this we could achieve a higher quality of semi-finished products and reduce costs for the purchase of chemicals. The process of manufacturing would take place without major interruptions. With excessive iron concentration phosphate bath needs to be pumped to the cleaning plant and bath needs to be reset. Proposed method would reduce the cost of cleaning plants for the treatment of heavy metals. We would also achieve a lower level of river pollution by discharges.
Secondary keywords:	zink-phosphate;iron;surface protection;phosphating;
URN:	URN:SI:UM:
Type (COBISS):	Bachelor thesis/paper
Thesis comment:	Univ. v Mariboru, Fak. za kemijo in kemijsko tehnologijo
Pages:	IX, 24 str.
ID:	8888647