Hardness test and method study of oxide film
·
In order to improve the wear resistance of aluminum alloy parts and prolong their service life, the hard anodizing treatment of aluminum alloys shows that correct measurement of oxide film thickness and hardness is the key to ensure the smooth progress of hard oxidation.
1.
Factors Affecting the Performance of Road Alloy Hard Anodized Film
Under low temperature conditions, the electrolyte is mainly divided into sulfuric acid medium through finely tunable micro-pulsed direct current, and the aluminum alloy piston is hard anodized to obtain thickness on the surface of the aluminum alloy workpiece.
≥0.04mm
,hardness
≥350HV
A wear-resistant, corrosion-resistant oxide film.
Oxide film hardness is the decisive factor affecting the wear resistance of the film layer, followed by the oxide film thickness. Its hardness is not only related to the aluminum alloy material and oxidation treatment process, but also directly related to the thickness of the oxide film. But the study found that the oxide film is not as thick as possible. After the thickness of the oxide film is thick, the hardness decreases. At the same time, in the production, it is not desirable that the oxide film is too thick, otherwise the oxide film may be cracked, thereby reducing the adhesion of the oxide film to the base metal and affecting the mechanical properties of the aluminum alloy. Therefore, accurate measurement of the thickness of the oxide film is the key to improving the performance of the oxide film.
2.
Design and test of oxide film thickness and hardness test system
As a destructive test method, the data obtained by the oxide film hardness test should have good reproducibility and accuracy, and the ratio can be stronger. There are many factors that affect the test results. If the measured microhardness value fluctuates within a large range or is very different from the expected value of the process, then the test is lost for the purpose of production service.
Test results of thickness and hardness of aluminum oxide film from different grades (see table)
1
It can be seen that the oxide film thickness and hardness test system design is very important to ensure the smooth oxidation of aluminum and its alloys. Recommended for this purpose
HV-1000Z
Automatic turret micro Vickers hardness tester and
HVS-1000Z
The digital automatic turret micro Vickers hardness tester is used as the main test equipment for testing the hardness and thickness of the oxide film. In the system design, the following requirements are emphasized. (Please consult: Shanghai Junzhun Instrument Equipment Co., Ltd.)
(
1
Prepare samples that meet the technical requirements, require the operator to be familiar with the performance of the test instrument and to achieve operational specifications, reasonably determine the location of the test points and select the load, and plan the test data.
(
2
) Make special sample fixtures to ensure the perpendicularity of the oxide film sample section and the test instrument to improve the test accuracy.
table
1
Test and data of oxide film thickness and hardness of different materials
HV-1000Z
Automatic turret micro Vickers hardness tester
product description:
HV-1000Z
Automatic turret micro hardness tester
The shell is integrally cast and processed, and the hole-punching alignment adopts a knife-type straight-through to ensure the concentricity coaxiality of each hole position, which lays a good foundation for the high precision and high stability of the machine. The hardness meter light source adopts Nanguangjin. The special high-definition imaging light source system on the phase microscope has uniform and clear light field brightness, which reduces the measurement error of the printing indentation. The operation interface adopts a menu structure, and the hardness scale can be selected on the operation panel.
HV
or
HK
, test the hardness value, manually enter the display. Various hardness values ​​can be converted to each other.
The error in hardness value can be corrected by software input to make the hardness value more accurate.
Application range:
Suitable for ferrous metals, non-ferrous metals,
IC
Sheet, surface coating, laminated metal; hardness test of depth and gradient of carbonized layer and quench hardened layer of glass, ceramic, agate, gemstone, etc.
HV-1000Z
Automatic turret micro hardness tester
The test head and the objective lens are switched at the time of testing, and the test points are automatically positioned accurately.
*
Software is optional:
Introduction to automatic hardness tester software
one,
use
Applicable to steel production, shipbuilding, automobile manufacturing, aircraft manufacturing, high-pressure vessels, electrical equipment, bearings, standard parts, hardware textile accessories and instrumentation accessories, and other related to metal materials products.
use
The software
The analysis results provided can make the enterprise quality control have more scientific basis, improve the management level of the enterprise and the appearance of the image. It is an effective tool for the enterprise to engage in the development of new technology products and product quality monitoring.
The software can also be used as an effective tool for theoretical teaching, experimental analysis and basic scientific research in scientific research units, manufacturing plants, universities and other departments related to metal materials.
Second, the function:
Computerized image analysis system for precise correction and gradient plotting. It can also be measured by eyepieces. Output measurement data
,
Image
,
Metallographic graphics
,
And hardness gradient map
,
Printable or saveable
.
The machine is a measurement image analysis system combining computer computer measurement system and hardness tester.
*
The hardness of the test indentation is measured by software conversion of the signal.
*
It is possible to test Vickers, Brinell, Knoop, carburized layer, nitrided layer, and the like.
*
The indentation image can be adjusted for contrast, brightness, and the like.
*
For the indentation obtained from a sample with a poor finish, an edge detection operation can be performed.
*
Indentation can
2
Magnification of × to better measure the test value.
*
The image file and the data file can be opened, stored, and printed separately in Chinese and English, and the data can be transferred.
Excel
Document processing and other processing.
*
Data files and image files can be viewed at any time, and data files are printed in the form of tables and curves.
*
High or low magnification objectives can be selected as needed.
*
stand by
WIN9X
,
WIN2000
,
WINXP
And other operating systems. Can be configured in a variety of micro hardness testers,
Various Vickers
/
Knoop hardness tester
.
With measurement length, angle attack energy, can be simple
Use with the projector.
Third, the complete set:
1
Image sensor camera
(Japan Sony chip color
1/3
HDCCD700
Line ) ) (standard)Japan HD
JVC
camera (high match) matching2
Image capture card
High resolution image real-time capture card
SDK2000
Type secondary development software package (standard)High resolution image real-time capture card
SDK3000
Type secondary development software package (high with)3.
Adapter and interface
4
, automatic hardness measurement software
(2012
Edition) (standard)Multiple control measurement software (multi-function version) (high with)
5
. Microcomputer and printer: current mainstream configuration warranty brand machine (optional)
Please consult for details
:
Shanghai Junzhun Instrument Equipment Co., Ltd.Aluminum Alloy LED lamps,Low Power LED lamps,LED wall washer
Kindwin Technology (H.K.) Limited , https://www.szktlled.com