Siti Hawa Mohamed Salleh
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Preferred name
Siti Hawa Mohamed Salleh
Official Name
Siti Hawa, Mohamed Salleh
Alternative Name
Salleh, S.H.
Salleh, S.
S.H., Salleh
Salleh, Siti Hawa
Main Affiliation
Scopus Author ID
36946763800
Researcher ID
AAA-9573-2019

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  • Publication
    Influence of flow accelerated corrosion on corrosion protection of mild steel in 3.5% NaCl solution
    ( 2024-03-07)
    Mahalaksmi Gunasilan
    ;
    Shaiful Rizam Shamsudin
    ;
    Mohd Rafi Adzman
    ;
    Siti Hawa Mohamed Salleh
    ;
    Wan Mohd Haqqi Wan Ahmad
    ;
    Mohamad K.A.A.K.
    Mild steel is a primary material used to construct ships and other maritime structures. Corrosion protection systems are sometimes ineffective in aqueous mediums subjected to movement, flow, waves, and even turbulence under unpredictable conditions. This study aims to ascertain the influence of flow velocity on mild steel corrosion in the aqueous medium. The mild steel samples are immersed in a 3.5% sodium chloride (NaCl) solution for five days. They were protected against corrosion using an impressed current cathodic protection (ICCP) system. The flow velocity is increased to 200-800 rpm, while the stationary flow is also examined as a control. Data on the metal's potential and current density were collected, and the surface morphology was analyzed using a stereomicroscope. Corrosion protection occurs exclusively in stationary flow, whereas corrosion occurs in solutions flowing at a most studied velocity. Metals show corrosion severity levels ranging from 200 to 600 rpm with increasing current consumption and metal potential. At 800 rpm, the metal surface appears to begin passivating, reducing the current consumption and potential. The flow velocity accelerates corrosion, yet at the high-speed stream, the corrosion is slowed because the steel surface becomes passive and assists the corrosion protection.
      23  1
  • Publication
    Effect of H₂/N₂ mixtures on reduction of nickel oxide
    (Trans Tech Publications Ltd., 2020)
    Salmie Suhana Che Abdullah
    ;
    Nur Nadia Mohd Nasri
    ;
    Siti Hawa Mohamed Salleh
    ;
    Nur Hidayah Ahmad Zaidi
    ;
    Imaduddin Helmi Wan Nordin
    This paper describes the reduction of nickel oxide under different gas mixture. The influence of gas mixture on phase, density, morphology and pore size of reduced nickel oxide were studied. Nickel oxide pellets sintered at 1400⁰C were reduced under various hydrogen-nitrogen gas mixtures, namely 40% H₂-60% N₂, 60% H₂-40% N₂, 80% H₂-20% N₂. Phase identification, density measurement and observation of morphology were conducted on samples before and after reduction process. Under all gas mixtures, nickel oxide was completely reduced to nickel. Density of the samples decreased in the range of 21% to 32% depends on H₂ percentage used. Results from the density shows that the higher the H₂ gas concentration, the smaller the density changes. Significant change in porosity of the sample before and after reduction was observed. Size of pore after reduction determined by H₂ concentration used during reduction where the higher the H₂ concentration resulted in large pore size.
      4  1
  • Publication
    Pengenalan kepada ujian bahan tanpa musnah
    ( 2013)
    Mohd Arif Anuar Mohd Salleh
    ;
    Khairel Rafezi Ahmad
    ;
    Dewi Suriyani Che Halin
    ;
    Siti Hawa Mohamed Salleh
    ;
    Muhammad Hafiz Zan @ Hazizi
    Pengenalan Kepada Ujian Bahan Tanpa Musnah merupakan sebuah buku yang membincangkan beberapa perkara asas yang penting dalam ujian tanpa musnah. Ia meliputi kebanyakan kaedah ujian tanpa musnah yang sering digunakan di industri. Buku ini memberi penerangan dalam ujian bahan tanpa musnah yang sering digunakan dalam industri bagi memeriksa kecacatan atau ketidaksempurnaan sesuatu bahan tanpa merosakkan atau memusnahkan bahan yang diperiksa. Keseluruhan kandungan buku ini merangkumi perbincangan dari aspek teori serta konsep pengujian, kaedah pengujian, dan aplikasi ujian dalam industri.
      1  666
  • Publication
    Asas logam
    ( 2011)
    Faizul Che Pa
    ;
    Ruhiyuddin Mohd Zaki
    ;
    Siti Hawa Mohamed Salleh
    ;
    Farah Farhana Zainal
    ;
    Mohd. Mustafa Al Bakri Abdullah
    ;
    Nurfazlin Abu Hassan
    Buku Asas Logam diterbitkan khusus untuk membimbing dan memberi panduan kepada para pelajar yang mengikuti pengajian Kejuruteraan Bahan terutamanya dalam bidang Metalurgi. Buku ini menggabungkan aspek teori dan praktikal yang wujud dalam keseluruhan pemprosesan logam. Secara keseluruhannya buku ini membolehkan pembaca memahami teori dan mengaplikasikan kejuruteraan Metalurgi di alam pekerjaan dan kehidupan harian.
      13  135