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Certificate of Analysis

HNO 3/HF/HClO 4 acid mixture in Teflon beakers For boron samples were spiked with isotopically enriched 10B and then were dissolved in quartz flasks with reflux condensers using a HNO 3/H 2O 2 mixture The digests were placed on either a cation or an anion exchange column to selectively remove the elements of interest The isotopic ratios were

chemical milling

US4900398A Chemical milling of titanium Google Patents Process for chemically milling titanium using an aqueous milling solution consisting essentially of (by weight) about 1% to 5% HF about 15% to 4% chlorate ion and optionally up to about 20% of an acid selected from the group consisting of H 2 SO 4 HCl and HNO 3 Live Chat

US Patent for Chemical milling of niobium Patent (Patent

A solution is described for the chemical milling of niobium and niobium-base alloys The solution contains about 25% HNO sub 3 about 19% HF balance H sub 2 O with additions of citric acid and ammonium formate to control the reaction rate and provide a smooth surface finish without intergranular attack and a small amount of a noble metal to control hydrogen absorption

Heavy Metals Leaching Behaviour Assessment of Palm Oil Clinker

The chemical composition morphology total organic carbon (TOC) and mineralogy were determined using XRF FESEM TOC analyzers and XRD t o select appropriate chemical reagents for complete digestion HNO 3 HF and HClO 4 were used for digestion of POC to measure heavy metal content using ICP-MS The chemical reagents CH 3 COOH NH 2 OH-HCl H

Chemical milling of titanium

13 02 1990The present invention comprehends a chemical milling solution for titanium comprising about 1% to about 5 % by weight HF about 1 5% to about 4% by weight chlorate ion (e g ca 20-50 g/l NaClO 3) and optionally up to about 20% by weight of a strong acid such as sulfuric acid (preferred) HCl or HNO 3

Chemical composition and liberation characterization of

Chemical composition and liberation characterization of printed circuit board comminution fines for beneficiation investigations I O Ogunniyi* M K G Vermaak D R Groot Department of Materials Science and Metallurgical Engineering University of Pretoria Mineral Sc Building Hatfield Pretoria 0002 South Africa article info Article history Accepted 3 March 2009 Available online xxxx

Titanium recast layer/alpha case removal

Titanium Recast Layer/Alpha Case Removal 2003 TSS is machining a titanium bearing housing from a forged round billet It is expected that the surface will have some recast layer or alpha-case present that will require chemical or mechanical removal Is there a spec that details the various methods that will successfully remove this layer?

Using Pickling and Passivation Chemical Treatments to

Chemical Surface Treatments These can be grouped into four categories Pickling - acids that remove impurities (including high temperature scale from welding or heat treatment) and etch the steel surface 'Pickling' means some of the stainless steel surface is removed Passivation - oxidizing acids or chemicals which remove impurities and enhance the chromium level on the surface

Separation and Purification of Quartz from Whole Rock

Physical and Chemical Preparation of Quartz from Rock 6 Hydrofluoric/Nitric Acid Leach Samples are leached in a dilute hydrofluoric/nitric acid solution in order to dissolve minerals other than quartz and to remove meteoritic 10Be Samples are generally leached twice in 1000 ml of a 5% HF/HNO

US5217569A

A solution is described for the chemical processing of beta phase-containing titanium alloys The solution contains HNO 3 and HF along with a small but effective amount of copper ruthenium rhodium palladium osmium iridium platinum or gold to reduce hydrogen absorption ammonium formate and citric acid to increase the milling rate and a surfactant to ensure a satisfactory milled surface

International Journal of Mass Spectrometry

Y -h Yang et al / International Journal of Mass Spectrometry 290 (2010) 120–126 121 mercially available MC-ICP-MS machines from the mid-1990s has mean that the combination of Rb–Sr Sm–Nd and Lu–Hf iso-tope systems has become a more powerful tool for understanding fundamental Earth processes especially in the fields of isotopic

US8580103B2

An aqueous electrolyte solution including a concentration of citric acid in the range of about 1 6 g/L to about 982 g/L and an effective concentration of ammonium bifluoride (ABF) and being substantially free of a strong acid Methods of treating the surface of a non-ferrous metal workpiece include exposing the surface to a bath of an aqueous electrolyte solution including a concentration of

US5217569A

A solution is described for the chemical processing of beta phase-containing titanium alloys The solution contains HNO 3 and HF along with a small but effective amount of copper ruthenium rhodium palladium osmium iridium platinum or gold to reduce hydrogen absorption ammonium formate and citric acid to increase the milling rate and a surfactant to ensure a satisfactory milled surface

Using Pickling and Passivation Chemical Treatments to

05/12/2017Mixtures of HF and HNO 3 are the most common and are generally the most effective Acids are available as a bath a gel or a paste Commercially available mixtures contain up to about 25% HNO 3 and 8% HF These chemicals etch the stainless steel which can roughen and dull the surface

Hazardous waste reduction from mixed acid titanium

This paper presents the findings of a technical study performed by the New York State Pollution Prevention Institute at Rochester Institute of Technology to evaluate process modifications that would reduce hazardous waste generated from the manufacture of titanium alloy turbine blades This study focused on the acid etch process step in which titanium alloy turbine blades are immersed in a

Chemical Milling Of Titanium Equipment

Chemical etching also known as chem etch or chemical milling is one of the quickest most cost-effective and adaptable manufacturing processes available for the creation of precision metal parts It offers a high-quality low-cost solution for creating custom thin metal pieces made to exact specifications

Post

Post-fabrication surface treatment of stainless steels Why surface finishing is important Stainless steel is shielded from the environment by a thin protec-tive and invisible surface layer – the passive film – that consists mainly of chromium oxide The oxygen content in the air or in water

Using Pickling and Passivation Chemical Treatments to

Chemical Surface Treatments These can be grouped into four categories Pickling - acids that remove impurities (including high temperature scale from welding or heat treatment) and etch the steel surface 'Pickling' means some of the stainless steel surface is removed Passivation - oxidizing acids or chemicals which remove impurities and enhance the chromium level on the surface