Document Type : Research Paper

Authors

• Raghad N. Salman ¹
• Razi J Al-azawi ²
• A. Kadhim ¹

¹ Laser and Optoelectronic Engineering Department, University of Technology-, Baghdad, Iraq.

² Laser and Optoelectronic Engineering Department, University of Technology-, Baghdad, Iraq

Abstract

The purpose of the study is to inhibit the corrosion rate using the (LSP) laser shock processing technology with an ND-YAG laser utilizing the Q-switched technique with a wavelength of 1046 nm for stainless steel 304 alloy. Laser shock processing (LSP) is a novel surface treatment approach for strengthening metal materials that use a high peak power, a brief pulse, and cold hardening. The laser parameters’ effect includes laser pulse energy and pulse repetition rate on the surface properties. The qualities of sample surfaces were investigated, including surface roughness and micro-hardness. The X-ray fluorescence technique was used to analyze the chemical composition of this alloy. The corrosion rate was measured using the polarization method. In particular, pitting corrosion was the option we picked. According to the findings, laser shock processing appears to considerably boost the micro-hardness of the LSP-treated sample. The corrosion causes a decrease in the rate. The result revealed that the corrosion current density was decreased, and the corrosion potential was shifted when the laser pulse energy and the pulse repetition rate were increased. When the laser energy was 920 mj and the pulse repetition rate was 6 Hz, we discovered the lowest rate of corrosion. Digital images are usually achieved by changing continuous signals to digital format. Many factors can affect the quality of an image, such as knowledge requirements, causing noise, low contrast, and badly-defined boundaries, among others. Specifically, we compared the results with those of the image processing.

Graphical Abstract

Highlights

• The micro-hardness was increased by 49% and the surface roughness by more than ten folds.
• The rate of corrosion was decreased by 93.45% when using laser pulses as corrosion inhibitors with an energy of 920 mJ and pulse repetition of 6 Hz.
• The results were compared with the image processing. 

Keywords

• Laser Shock Processing
• Micro Hardness
• Surface Roughness
• Corrosion Inhibitor
• Image Processing

Main Subjects

• Electrical
• Material