Preparation Test Lab Report
2.0 Materials and Methods
2.1 Sample preparation
Experiments are conducted on aluminum alloy with nominal composition of Si 0.4, Fe 0.5, Cu 2.0, Mn 0.3, Mg 2.9, Cr 0.28, Zn 6.1, Ti 0.2 and Al balance in wt%. Cylindrical specimens with 24 mm diameter and 5 mm thickness were used for the ENi-B deposition. Aluminum and its alloy exposed to air are always covered by a dense oxide coating that must be removed before the parts are to be plated; therefore to enhance adhesion proper pretreatment is obligatory. Sample preparation for coatings was as follows: (a) mechanically polished with wet 400, 600, 800 and 1000 grit SiC paper, (b) cleaning with acetone followed by a methanol wash, (c) acid pickling for 2min (10% HNO3 + 3% HF by volume), the samples
…show more content…
Fig.8 Average roughness value (Ra) for ENi-B coatings : A without surfactant; B with SDS; C with CTAB; D with Zwitterionic 0.1M; E with Zwitterionic 0.2M; F with Zwitterionic 0.3M; G with Zwitterionic 0.4M
3.5 Corrosion characteristics
The corrosion resistance of the bare, ENi-B coatings without surfactant and with zwitterionic surfactant was investigated by potentiodynamic polarisation tests in 3.5 wt% NaCl (shown in Figure 9). The corrosion parameters (see Table 4) indicate that the ENi-B coatings without surfactant assured excellent protection of aluminum alloy against corrosion. This is due to the fact that surfactant itself is an electrolyte, in addition to the ions in the aqueous solution, which produce a galvanic (Bimetallic) corrosion which is observed by means of the oxidation potential of the respective metals. In the current case aluminum and nickel are fused together and to be suspended in the surfactant to make one metal as the anode and the other a cathode. Due to cathodic protection, the anode probably aluminum may get corroded which is read as a sacrificial anode to protect the nickel
Nt1310 Unit 8 Lab Report
788 Words | 4 PagesThe design relied on two Schmitt triggers to generate the two different tones while using the transistors to act as a switch. This causes it to trigger continuously between two unstable states, allowing automatic switching between two frequencies producing two different tones. The RC values between the two Schmitt triggers will differ. Capacitors charge and discharge faster when it’s resistance is smaller.
Nt1310 Unit 2 Lab Report
638 Words | 3 PagesFor most sequences at position 4 and 5 we observe only the nucleotides G and T, respectively. There may be rare cases where other nucleotides may also be found. To consider such observations, we need to do a process called additive smoothing or Laplace smoothing to smooth the categorical data. [9] In this case, we add 4 sequences: AAAAAAAAA, CCCCCCCCC, GGGGGGGG, TTTTTTTTT.
Pt1420 Unit 2 Lab Report Sample
695 Words | 3 PagesFrom the data obtained in Tables 1-3, we were able to plot multiple graphs using excel. These graphs give a better representation of the data as seen in Figures 1-9. It can be seen that each figure shows a slight increase in CO2 production, which signifies a possible change in metabolic rate. Figures 4 and 7 show a relatively large change between the control and fox urine. The changes in slope between theses two are 0.0267 for Figure 4’s slopes and 0.0192 for Figure 7’s slopes.
Nt1310 Unit 2 Lab Report
310 Words | 2 PagesI need to find the area of rectangle ABCD. I know that ABCD is a rectangle with diagonals intersecting at point E. Segment DE equals 4x-5, segment BC equals 2x+6, and segment AC equals 6x. I predict that To find the area of rectangle ABCD I need to find out the base and height of the rectangle. The first step is to find what x equals. Since I know the intersecting line segments AC and DB are congruent that means when I times the equation 4x-5 for segment DE by two it will equal the equation 6x for segment AC.
Nt1310 Unit 7 Lab Report
574 Words | 3 PagesExperiment 7 In this experiment we configured several DC circuits consisting of an emf and a network of resistors. The circuits were composed of a power supply, two DMMs, a circuit board, an SPST switch, and an assortment of known resistors along with one unknown resistor. We measured the current and voltage of the entire circuit as well as the potential drops across each resistor to determine the parameters of the circuit including the resistance, voltage, and current for each component.
Nt1310 Unit 10 Lab Report
302 Words | 2 Pages%% Init % clear all; close all; Fs = 4e3; Time = 40; NumSamp = Time * Fs; load Hd; x1 = 3.5*ecg(2700). ' ; % gen synth ECG signal y1 = sgolayfilt(kron(ones(1,ceil(NumSamp/2700)+1),x1),0,21); % repeat for NumSamp length and smooth n = 1:Time*Fs '; del = round(2700*rand(1)); % pick a random offset mhb = y1(n + del) '; %construct the ecg signal from some offset t = 1/
Nt1310 Unit 4 Lab Report
603 Words | 3 PagesSuppose we have a single-hop RCS where there is one AF relay that amplifies the signal received from a transmitter and forwards it to a receiver. Assume that the transmitter sends over the transmitter-to-relay channel a data symbol ${s_k}$, from a set of finite modulation alphabet, $S={S_1, S_2,ldots,S_{cal A}}$, where ${cal A}$ denotes the size of the modulation alphabet. The discrete-time baseband equivalent signal received by the relay, $z_k$, at time $k$ is given by egin{equation} z_k = h_{1,k}s_k + n_{1,k},~~~~for~~k=1,2,ldots,M label{relaySignal} end{equation} where $n_{1,k}sim {cal N}_c(0,sigma_{n1}^2)$ is a circularly-symmetric complex Gaussian noise added by the transmitter-to-relay channel, $h_{1,k}$ denotes the transmitter-to-relay channel, and
Nt1310 Unit 2 Lab Report
247 Words | 1 Pages1. The test subjects will prepare for sleep by acquiring everything needed for the subjects’ sleep preferences. 2. The test subjects will all set alarms on their smartphones for approximately 6, 8, and 10 hours after the subjects’ enter the resting period (Subjects may wake during the resting period for the bathroom, but they must not stay awake for more than ten minutes at a time to prevent as much deviation as possible.). 3.
Nt1310 Unit 1 Lab Report
362 Words | 2 Pages1. There are two ways of maximizing points in this experiment. The first one is that I should connect myself to a vertex that is in the biggest component and purchases immunization. Since the probability of being infected is based off of expected value, I would have less than 1% chance of getting infected. The second way is that I try to make myself stay in the second-largest connected component.
Nt1330 Unit 6 Lab Report
74 Words | 1 Pages1. What area/aspect of this setting is the most challenging? 2. In the setting, you work in, is there a certain population of patients you see more? How does this affect you?
Nt1310 Unit 9 Lab Report
1392 Words | 6 Pages1. Identify the range of senses involved in communication • Sight (visual communication), Touch (tactile communication), Taste, Hearing (auditory communication), Smell (olfactory communication) 2. Identify the limited range of wavelengths and named parts of the electromagnetic spectrum detected by humans and compare this range with those of THREE other named vertebrates and TWO named invertebrates. Figure 1: the electromagnetic spectrum source: www.ces.fau.edu Vertebrates Human Japanese Dace Fish Rattlesnake Zebra Finch Part of electromagnetic spectrum detected ROYGBV (visible light) detected by light sensitive cells in the eye called rods and cones.
Nt1310 Unit 3 Lab Report
1160 Words | 5 PagesLab 1 helps create a better understand of the changes in crystal structures when the annealing and quenching process is applied to 1020 and 1080 steel. The numbered steel refers to the ASTM grain-size number. Formula 1 is used to solve for the grain size. n=2^(G-1) Equation (1) at 100x magnification Crystal structures change shapes which changes the strength of the material and its properties. The metal might become soft, brittle, hard, or ductile.
Nt1310 Unit 3 Lab Report
1225 Words | 5 PagesActivity 1 Increasing extracellular K+ reduces the net diffusion of K+ out of the neuron through the K+ leak channels because it caused to decrease in the concentration gradient. Increasing extracellular K+ causes the membrane potential to change to a less negative value because extracellular K+ is increasing, which it will cause intracellular K+ to be less. A change in extracellular Na+ did not alter the membrane potential in the resting neuron because there are a lot of K+ leak channels than Na+ leak channels The relative permeability of the membrane to Na+ and K+ in a resting neuron is that Na+ leak channel is less, but K+ leak channels has more so the membrane become less permeable to Na+.
Paper Chromatography Lab Report
767 Words | 4 PagesLeah Romero 10/30/2017 Conclusion Lab 3 Chem 102L In lab 3, fundamentals of chromatography, the purpose was to examine how components of mixtures can be separated by taking advantage of different in physical properties. A huge process in this lab was paper chromatography, which was used to isolate food dyes that are found in different drink mixes. The different chromatograms of FD&C dyes were compared to identify which dyes are present in each of the mixes.
Buffer Lab Report
1344 Words | 6 PagesIntroduction Buffer is a solution that resists a change in pH when bases or acid are added. Solutions that are acidic contain high concentrations of hydrogen ions (H+) and have pH values less than seven. Buffer usually consist of a weak acid, and its conjugate base or a weak base and its conjugate acid. The function of buffer is to resist the changes in hydrogen ion concentration as a result of internal and environmental factor. This buffer experiment is important so that we relies the important of buffer in our life.
More about Preparation Test Lab Report
Nt1310 Unit 8 Lab Report
788 Words | 4 PagesNt1310 Unit 2 Lab Report
638 Words | 3 PagesPt1420 Unit 2 Lab Report Sample
695 Words | 3 PagesNt1310 Unit 2 Lab Report
310 Words | 2 PagesNt1310 Unit 7 Lab Report
574 Words | 3 PagesNt1310 Unit 10 Lab Report
302 Words | 2 PagesNt1310 Unit 4 Lab Report
603 Words | 3 PagesNt1310 Unit 2 Lab Report
247 Words | 1 PagesNt1310 Unit 1 Lab Report
362 Words | 2 PagesNt1330 Unit 6 Lab Report
74 Words | 1 PagesNt1310 Unit 9 Lab Report
1392 Words | 6 PagesNt1310 Unit 3 Lab Report
1160 Words | 5 PagesNt1310 Unit 3 Lab Report
1225 Words | 5 PagesPaper Chromatography Lab Report
767 Words | 4 PagesBuffer Lab Report
1344 Words | 6 Pages