The extract of honeycomb waste was studied as a corrosion inhibitor on 304 stainless steel in H2SO4 solutions. The honeycomb waste was obtained from beekeeping at Lawang-Malang, East Java, Indonesia. Electrochemical and scanning electron microscopy methods were used to investigate the performance of the corrosion inhibition process. The inhibition efficiency of the inhibitor (2000 mg/L) reached 97.29% in 0.5 M H2SO4 and decreased with the acid concentration. Kinetic parameters were calculated to explain the effect of acid concentration on the inhibition process. The study on the adsorption behavior of the extracts followed the Frumkin isotherm model. The adsorption of the inhibitor on the 304 stainless steel surface was confirmed by the negative and lower values of Gibbs free energy. The obtained scanning electron microscopy (SEM) images were confirmed by comparing the surface of the specimens with and without inhibitor after corroding for one week. The results indicated that the extract acted as a good inhibitor for 304 stainless steel in acid corrosion.
Pandemi COVID-19 memberikan beberapa dampak negatif pada sektor usaha di Indonesia. Pembatasan akibat pandemi memaksa sektor usaha untuk memangkas biaya produksi, penurunan omset penjualan, hingga usaha yang akhirnya harus ditutup. Pasca pandemi COVID-19, sektor usaha diharapkan dapat bangkit kembali. Pesanten Anwarul Huda (AH), Malang memiliki beberapa sektor usaha mandiri, salah satunya adalah produksi kripik tempe yang berusaha bangkit pasca pandemi. Namun, proses produksi dengan pengirisan tempe manual memakan waktu lama serta hasilnya tidak seragam. Kelemahan pada faktor produksi menjadi isu yang perlu diselesaikan dalam peningkatan usaha mandiri kripik tempe. Berangkat dari isu produksi tersebut, program Pengabdian Kepada Masyarakat (PKM) diberikan kepada pondok Anwarul Huda untuk meningkat usaha pondok Anwarul Huda. Mesin pemotong tempe didesain dan dibuat untuk mengatasi permasalahan produksi kripik tempe. Selain pembuatan peralatan mesin produksi, pelatihan pengoperasian, perawatan mesin, serta pengemasan dan pemasaran kripik tempe juga dilakukan dalam program ini. Hasil menunjukkan bahwa kripik tempe yang dihasilkan memiliki ketebalan yang sama dan waktu produksi lebih cepat. Diharapkan program keberlanjutan pada produk lainnya untuk mendorong kemandirian unit usaha pondok Anwarul Huda.
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