Register

Create your own FREE account with surfacequery.com and we will contact you with more details about a subscription or a one-off search.

More details…

Search

Here you can perform a record search by entering keywords.

You can use the special keywords AND, OR and NOT in between words to refine your search.

This search also supports the wildcard character * and the use of quotes.

Subscription or one-off search

With a subscription or a one-off seach, the "author", "journal", "source", "date", "volume" and "page" details are presented along with the "abstract titles" and "anstracts".

More details…

5592 results. per page « 2 3 4 5 6 7 8 9 10 11 12 »

Dealing with Leakages of Toxic Liquids

Relevancy:  

The installation of sensors (mostly conductivity) for detection of leaks from storage containers or process vessels is described with sketches.

Dealing with Oils & Greases in Effluents

Relevancy:  

Overview with no refs,no data, describes physical and chemical methods for handling oils & greases in effluents, including skimming, flocculation.

Dealing with plating bath contamination

Relevancy:  

Zinc plating of cast iron components is discussed. The surface carbon content of the cast-iron can cause problems. Acid etching can leave carbon particles proud of the surface and an acid inhibitor should therefore be used. Reverse current or anodic electrocleaning is recommended. A step-by-step process sequence is provided. Problems of hexavalent chromium ion contamination in a zinc plating bath. Note that Cr(VI) concentrations in excess of 15 mg/L can lead to blister formation and skip plating. A procedure is shown for reducing hexavalent to trivalent chromium by addition of bisulphite. Lead contamination of alkaline non-cyanide zinc plating solution. This will cause an overall dark/iridescent appearance after chromating. Lead concentrations in excess of 5 mg/L are not acceptable. Treatment using zinc dust is described.

Dealing with sealing of anodised aluminium

Relevancy:  

Reviews hot water and Ni acetate sealing, double sealing, low- and moderate temp. processes, sealing in architectural, automotive and aeronautical anodizing applications.

Dealing with solid toxic wastes

Relevancy:  

Treatment of cyanides arising in metal hardening by means of pyrolysis or electrolysis is discussed. In every case addition of sulphate is required in order to bind Ba ions present. Salts may alternatively be mixed with spent oil and incinerated. Salts containing BaCO3 are treated with 10% HCl soln. to pH 3-4, and excess of FeSO4 and 1% CuSO4 are added and allowed to react for 20 min. after which lime is added to at least pH 8, wood flour is added and product incinerated. Nitrite wastes can be incinerated although chemical consumption is very high (24.3 kg FeSO4 and 5.9 kg NaOH per kg NaNO2) or conversion in soln. to nitrate using NH4NO3.

Dealing with spent electroless nickel

Relevancy:  

Principles, limitations and modifications of 2 chemical pptn methods for treatment of spent chemical Ni plating solns. were studied. It was found that Ni-EDTA complex (log K1) was much more stable than all other Ni-organic complexes tested. Standard EDTA titration method was modified for measuring all Ni species. Ni pptn. as Ni(OH)2, Ni*0 and NiB2 were interfered with by organic acids which form stable Ni complexes. NH4 citrate was most powerful complex used in 6 hypophosphite reduced EN baths studied and pH adjustment alone using NaOH was ineffective. At pH 10, hydroxide pptn. did not substantially remove Ni concn. containing malic or aminoacetic acid. Ni-asminoacetic acid complexes remained stable at pH 12. Depending on pH and type and concn. of complexing agents, extended settling of Ni(OH)2 may increase or decrease residual Ni concn. Ni was removed from all sons. as Ni*0or NiB2 by reaction with Na borohydride. BH4 served as primary reducing agent and catalyst, initiating reduction by hypophosphite. Spent EN bath containing lactic acid was easy to treat, even with Ni concn. as high as 18.5 g/l, and both pptn methods reduced Ni concn. to < 1 mg/l. Less Na borohydride wouldbe required with pretreatment by pH adjustment to pH ca. 7.6. Borohydride treatment was more expensive in chemical cost but lower in sludge disposal cost, Ni ppt. being dissolved in H2SO4 and reused in EN baths. Spent bath containing NH4 citrate was difficult to treat. Pretreatment by oxidation improved hydroxide ATK pprtn. but adversely affected borohydride treatment. Addition of CaCl2 improved Ni removal by both pptn methods. It is concluded that with proper modifications, pptn. methods can be applied to most EN baths at cost lower than off-site disposal.

Dealloying below the critical potential

Relevancy:  

JES Binary Ag-Au & Cu-Au alloys were studied to elucidate further the well-known phenomenon where different anodic dissolution behaviour occurs above or below the critical potential. Current-voltage plots, STM micrographs & electrochemical transients are shown. Kinetic equations are derived for a mechanism based on vacancy formation. 22 refs

Dealloying of Copper Gold Alloys in Aqueous Solution by Electrochemical Noise Measurement

Relevancy:  

Potentiostatic experiments emphasise role of surface roughening kinetics on polished and non-polished samples above and below critical dealloying potential (Vc).

Debonding paint from metal substrate

Relevancy:  

Electrolytic debonding of paint from metal by placing anode mesh between 2 elec. blankets over paint coating; applying aq. electrolyte on these; and passing current with metal component cathode causing debonding of paint.

Debonding study of nickel-base substrate/platinum coatings interfaces using laser shock waves: characterization of the targets and experimental study

Relevancy:  

SURF Presents set of laser shock debonding experiments performed using 2 kinds of targets constituted of Ni-base substrate covered with coatings of Pt several µm thick. By applying laser shocks of increasing amplitude with different pulse durations between 600 ps and 3 ns, decohesion of coatings was observed above threshold intensity. Depending on quality of interface and on loading shape and duration, nature of damage in target changed and some cohesive rupture in substrate was observed in case of diffused coating. Experimental data are interpreted by mechanisms of shock wave propagation in 2 layer targets,evidencing influence of loading and thickness of both layers on laser intensity leading to debonding. Interest in collecting data on debonding threshold by laser spallation to validate numerical criterion able to simulate decohesion is shown.

Debris removal in high aspect structures.

Relevancy:  

A method of debris removal is provided. The method includes positioning a nanometer-scaled tip adjacent to a piece of debris on a substrate. The method also includes adhering the piece of debris to the tip. In addition, the method also includes removing the piece of debris from the substrate by moving the tip away from the substrate.

Debunking myths about vacuum impregnation

Relevancy:  

Mainly in reference to sintered and powder metallurgical work, author discusses history & origins of process, which components should be sealed, porosity is explained in terms of 3 types of pore. The process of vacuum impregnation is explained with comments on reliability. Emphasised that impregnation is no panacea for generally defective or poor quality work. That sealing should be out-sourced is advised, and alternatives are reviewed. For coated metal components, impregnation can improve coating quality as here explained.

Deburring & cleaning of complex forms using high-pressure water

Relevancy:  

Description with photos, including range of application areas, but minimal data, of title processes.

Deburring & cleaning of complex forms using high-pressure water

Relevancy:  

Description with photos, including range of application areas, but minimal data, of title processes.

Deburring & Cleaning in a Single Stage

Relevancy:  

Use of high pressure water jets for one-step deburring & cleaning, e.g of engine cylinder blocks, is shown with sketch of plant layout.