Recent content by k_amy21

thank you, chemisttree, for your answer. do you prehaps know where can I find it´s chemical and physical properties? I´ve tried searching all over the internet, but I couldn´t find anything. I would appreciate it very much..

Hi, can someone please clarify me what does the standard "API Q125" in material designation mean? Does it stand for one particular steel grade or it has something to the with physical properties? And what does this "Q125" exactly means? Thank you. Regards Amy

Thank you for your fast respond and sorry for not answering sooner. I was searching all over the internet to try to find anything about this PH13-5 alloy. Unfortunately, I wasn´t able to find anything about it. Astronuc: - Where did you just find the name of that alloy!? Thanks for the file...

Name of the steel alloy?!? Hi, can someone please tell me how can I find out the name of an alloy if I have its composition? Here are the percentages of each element inside: Composition in % (min ;max) C ( - ; 0.05) Si...

I think this metal part around the vessel is preety secure (like some kind of valve), but these red plastic things which are holding the top I-don´t-know-what´s-it-cold :smile: could loosen after a while. I am just searching for the easiest way to set up my experiment and it will, obviously, be...

hi, I need to expose metallic material in the WATER for a certain period of time (3, 6 and 12 months) at 100 °C (+/- 5 °C) and normal pressure. Is it possible to do that without using coolers? I was thinking of putting the glass vessels in the oven and closing it with some "special"...

Thanks, Borek, for you quick respond. Regards

Hi, can someone please tell me what does an expression "to activate the surface" in electrochemistry mean? Brief explanaiton of situation: I am investigating the corrosion resistance of certain metals by means of electrochemical methods. During the grinding of the working electrode...

Thank you, chemisttree, for such a comprehensive response. I will sure try to do what you suggested me. But I have to say that I tried making the solution in 2 ways. 1st way: I diluted Na-silicate in DI water (clear, transparent solution was made) and after that I added salts...

Yes, I know it seems a bit irracional, but this is a simulation of a geothermal fluid. It needs to be the same composition as in the nature in order to conduct my experiments (corrosion tests) in the laboratory. Anyway, thanks a lot for this discussion. Although we didn´t not solve my...

I assume these silicates cause the major problem in this solution. As soon as I start adding the salts in the solution of sodium silicate, the silica precipitates. And that´s all right, I don´t need to have a homogenous solution where everything is dissolved in side. I just need to have a STABLE...

Wow, you are really fast. ;) My question “How much of a CO2 can evolve from that concentration?” was actually rhetorical ;), but now that you´ve mentioned it I did some calculations. According to these equations: HCO3- + H+ -> H2CO3 -> H2O + CO2 where: γ(HCO3-) = 0.15 g/L =>...

Hi Borek, first of all thank for such a quick respond. I was thinking about the CO2 effervescence as one of possible things that happens, it´s just that I have only 0.15 g/L of HCO3-. How much of a CO2 can evolve from that concentration? And, yes, unfortunately my system is open and it...

How to stabilize pH of the solution that containes silica? Hello, I have a problem with adjusting the pH of my solution to value 7. It contains these chemicals: Na2SiO3, CaCl2, KCl, Na2SO4, NaHCO3 and NaCl. The initial pH (after adding all of these stuff) is around 10. The problem occurs...

Thank you pantaz & SteamKing very much. A.