35results about How to "Reduce sample preparation costs" patented technology

A borate solution used to predict phosphorization ability of cold-rolled sheet has solute concentration of 0.01-0.1 / mole and its solution pH value is 4-6.9 under normal temperature of 20-30 deg.c.

The invention discloses a method for quickly evaluating the phosphability of cold-rolled sheets. The steps are as follows: Step 1. Prepare a sodium tetraborate solution, and then adjust the pH value of the solution with hydrochloric acid at a concentration of 1:1, and the adjusted sodium tetraborate solution The solute concentration is 0.05 mol / liter, and the pH value of the solution at 25°C is between 5.5 and 6.9; step 2, place the cold-rolled sheet to be tested in the above-mentioned sodium tetraborate solution; step 3, use a potentiostat to record the cold The dynamic change process of the potential value of the rolling plate after entering the above solution, when an obvious inflection point appears, the test is terminated, and the potential-time record chart is obtained on the potentiostat; Steps 4 and 5, according to the abscissa of the inflection point on the potential-time record chart Value, that is, the time value of the inflection point, to judge the phosphating sensitivity of the cold-rolled sheet, and analyze and predict the phosphating film quality of the cold-rolled sheet after phosphating. The invention can quickly and accurately evaluate the phosphating characteristics of the cold-rolled sheet, predict the coating quality of the cold-rolled sheet, and has wide applicability.

The invention discloses a method for preparing a ''nasal tip-shaped'' sample used for a FIB three-dimensional reconstruction. The method comprehensively applies means of cutting technique, electrochemical polishing and sanding. The method has the process characteristics that: performing a normal gold phase sample preparation; marking a to-be-detected sample under an optical microscope or a scanning electron microscope; performing rough machining by adopting a cutting technique to cut the sample into a L-shaped or strip-shaped sample, the to-be-detected area is located at the front end of the sample and forming a ''nose tip'' preliminarily, wherein the width of the ''nose tip'' is 1 mm or less; polishing the two sides of the ''nose tip'' by a high-mesh sandpaper or corroding the front end of the sample by means of electrochemical polishing to further reduce the width of the ''nose tip'' to 100 [mu]m or less; and refining the ''nose tip'' into a specified size by adopting an FIB system.The method has the advantages that the sample preparation cost is greatly reduced under a condition that the qualities of an obtained sample is consistent with a prepared sample adopting an FIB traditional hole digging technology, and the popularization and application of the FIB in a three-dimensional characterization analysis are forcefully promoted.

The invention belongs to the technical field related to laser welding, and discloses a method for analyzing the microstructure nucleation mechanism of a laser welding seam. The method includes the following steps: (1) performing laser welding on sample 1, that is, test welding, and Analyze the microstructure and distribution of the laser welded seam; at the same time, TIG welding is used to perform 1 pre-welding and n-pass pre-welding on sample 2-1 and sample 2-2, respectively, and then the welds formed by pre-welding respectively Perform test welding on the above, and carry out metallographic characterization on the obtained overlapping welds; wherein, the material of sample 1, sample 2-1 and sample 2-2 are the same; n is a positive integer greater than or equal to 3; (2) Compare the number and distribution of equiaxed grains in the laser weld and overlapping weld area of ​​sample 1, and pre-identify the nucleation mechanism of the weld according to the comparison results; (3) Confirm according to the pre-identification results to analyze get the nucleation mechanism. The invention improves the accuracy and repeatability of identifying the nucleation mechanism.

The invention discloses a silty mudstone similar material and a preparation method thereof. The silty mudstone similar material is composed of the following parts by mass: 20-80 parts of gypsum, 20-80 parts of organically modified montmorillonite powder, and nano-alumina 0.3-3.6 parts, 10-21 parts of saturated alcohol rosin solution. The silty mudstone similar material of the invention has high similarity with silty mudstone, wide adjustment range of mechanical parameters, good plasticity and uniformity, wide source of raw materials, low price and simple preparation method.

The invention discloses a malachite chemiluminescence ELISA detection method and a kit. According to the invention, it is the first time to discuss chemiluminescence ELISA mechanism of malachite, a malachitechemiluminescence ELISA detection system and a detection method are successively established, and perfect combination of high sensitivity and high specificity is realized. The kit provided by the invention has high sensitivity, accuracy, precision and stability, is used to simplify operation steps and reaction time and reduce errors caused by complex operation, is very suitable for trace analysis and batch detection of malachite residues, and is of great practical application significance.